[R-390] R-390 Digest, Vol 263, Issue 11
Russ Dworakowski
wb3fau55 at neo.rr.com
Sat Jun 20 11:47:40 EDT 2026
Set screws are spline screws, same as Allen pants different head
Sent from my iPhone
> On Jun 16, 2026, at 11:10 PM, r-390-request at mailman.qth.net wrote:
>
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> Today's Topics:
>
> 1. Re: Removing Megacycle Change shaft (Nick England)
> 2. Re: Removing Megacycle Change shaft (Nick England)
> 3. Re: Weird looking set screws (Jacques Fortin)
> 4. Re: Weird looking set screws (Fred Moore)
> 5. Re: Removing Megacycle Change shaft (Barry)
> 6. Re: Weird looking set screws (Renee K6FSB)
> 7. Re: Weird looking set screws (Fred Moore)
> 8. Re: Weird looking set screws (Jordan Arndt)
> 9. Re: Removing Megacycle Change shaft (Jacques Fortin)
> 10. Re: Weird looking set screws (Tisha Hayes)
> 11. Re: Weird looking set screws (robert meadows)
> 12. Re: Weird looking set screws (Edward Zeranski)
> 13. Re: Removing Megacycle Change shaft (Paul Roche)
> 14. Re: Weird looking set screws (Dave Merrill)
> 15. Re: Weird looking set screws (Fred Moore)
> 16. Re: Weird looking set screws (robert meadows)
> 17. Re: Weird looking set screws (Barry)
> 18. Re: Weird looking set screws (Barry)
> 19. Re: Removing Megacycle Change shaft (Jacques Fortin)
> 20. Re: Removing Megacycle Change shaft (Paul Roche)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 16 Jun 2026 12:19:20 -0400
> From: Nick England <nick at navy-radio.com>
> To: "r-390 at mailman.qth.net" <r-390 at mailman.qth.net>
> Subject: Re: [R-390] Removing Megacycle Change shaft
> Message-ID:
> <CAB55hNcn-GHX=MEJB0XuaP_vOhBdp6+8ONqQ9zY9p+CH1=JL1w at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Reminder FWIW - the R-390A manufacturing drawings are all on line at
> https://www.navy-radio.com/rcvrs/r390a/drawings.htm
>
> You can look in the manual at the parts list to see the drawing number
> that covers a particular part.
> https://www.navy-radio.com/manuals/r390a-063-2010-7004.pdf
>
> Have fun,
> Nick England K4NYW
> Chapel Hill NC
> www.navy-radio.com
>
>> On Tue, Jun 16, 2026 at 11:45?AM rochep--- via R-390
>> <r-390 at mailman.qth.net> wrote:
>>
>> Actually I think I just need to get to the gearbox disassembly to the point of Steps/Pictures 12-16 in Chapter 10 in the manual. Once I get the gear off the MHZ shaft I am good.
>>
>> From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> on behalf of rochep--- via R-390 <r-390 at mailman.qth.net>
>> Date: Tuesday, June 16, 2026 at 11:40?AM
>> To: Jacques Fortin <jacques.f at videotron.ca>; 'Jordan Arndt' <Outposter30 at shaw.ca>; r-390 at mailman.qth.net <r-390 at mailman.qth.net>
>> Subject: Re: [R-390] Removing Megacycle Change shaft
>>
>> I agree, taking out the gearbox is what I am looking at. Got alot more to learn before getting at this, I assume the entire RF deck and gearbox comes out together. Lots of YouTube videos to follow. Thank you all!
>>
>> Paul
>>
>> From: Jacques Fortin <jacques.f at videotron.ca>
>> Date: Tuesday, June 16, 2026 at 11:21?AM
>> To: 'Jordan Arndt' <Outposter30 at shaw.ca>; 'PAUL ROCHE' <rochep at comcast.net>; r-390 at mailman.qth.net <r-390 at mailman.qth.net>
>> Subject: RE: [R-390] Removing Megacycle Change shaft
>>
>> Hi Jordan,
>> Not sure about this clamp ID, but it must have a 13/32" hole to fit the gear
>> part that it have to hold to the shaft.
>> See attached picture.
>> The ultimate problem that Paul is facing will be to remove the broken clamp
>> there without damaging anything else around.
>> Using a two-part clamp is a good idea, medium hard to machine, but there can
>> be other hidden mechanical damages in his set.
>> We never know what happened to these radios before.
>> To maintain (or restore) those requires both electrical and mechanical
>> skills.
>>
>> IMHO, Paul should attempt a gearbox disassembly, cleaning and reassembly
>> (Y2K-R3a manual Chapter 10).
>> At least, he will be able to catch any other marginal mechanical flaw within
>> during the process.
>> This is one of the worst case I seen so far: a clamp broken at the worst
>> possible place, but.. any other broken clamp within the gearbox will require
>> disassembly, anyways.
>>
>> There is other "stupid" damages I was able to see in my "spare" EAC RF deck
>> yesterday night: some of the clamp screws heads are "eaten" internally, most
>> probably because someone tried to use Allen bits instead of Bristol ones on
>> those.
>> That one will be due for a complete overhaul, I believe: it is completely
>> gummed up, also.
>>
>> PAUL: just a comment...
>> The answers you provided came to me OK directly to my email address, but the
>> same text did not "passed" thru the forum: the postings came to me "empty".
>> I cannot tell why, but have a check...
>>
>> 73, Jacques, VE2JFE in Montreal
>> ______________________________________________________________
>> R-390 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:R-390 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> ______________________________________________________________
>> R-390 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:R-390 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 16 Jun 2026 12:24:53 -0400
> From: Nick England <nick at navy-radio.com>
> To: "r-390 at mailman.qth.net" <r-390 at mailman.qth.net>
> Subject: Re: [R-390] Removing Megacycle Change shaft
> Message-ID:
> <CAB55hNc72SeQK-AF=mEtjCPsUYX2uEN3z7XRv6XXmWSV8eZC1Q at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Maybe the clamp in question is this one?
> https://www.navy-radio.com/rcvrs/r390a/drawings/17310-00/00-85-SM-B-170763-CLAMP.pdf
>
> Nick England K4NYW
> Chapel Hill NC
> www.navy-radio.com
>
>> On Tue, Jun 16, 2026 at 12:19?PM Nick England <nick at navy-radio.com> wrote:
>>
>> Reminder FWIW - the R-390A manufacturing drawings are all on line at
>> https://www.navy-radio.com/rcvrs/r390a/drawings.htm
>>
>> You can look in the manual at the parts list to see the drawing number
>> that covers a particular part.
>> https://www.navy-radio.com/manuals/r390a-063-2010-7004.pdf
>>
>> Have fun,
>> Nick England K4NYW
>> Chapel Hill NC
>> www.navy-radio.com
>>
>>> On Tue, Jun 16, 2026 at 11:45?AM rochep--- via R-390
>>> <r-390 at mailman.qth.net> wrote:
>>>
>>> Actually I think I just need to get to the gearbox disassembly to the point of Steps/Pictures 12-16 in Chapter 10 in the manual. Once I get the gear off the MHZ shaft I am good.
>>>
>>> From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> on behalf of rochep--- via R-390 <r-390 at mailman.qth.net>
>>> Date: Tuesday, June 16, 2026 at 11:40?AM
>>> To: Jacques Fortin <jacques.f at videotron.ca>; 'Jordan Arndt' <Outposter30 at shaw.ca>; r-390 at mailman.qth.net <r-390 at mailman.qth.net>
>>> Subject: Re: [R-390] Removing Megacycle Change shaft
>>>
>>> I agree, taking out the gearbox is what I am looking at. Got alot more to learn before getting at this, I assume the entire RF deck and gearbox comes out together. Lots of YouTube videos to follow. Thank you all!
>>>
>>> Paul
>>>
>>> From: Jacques Fortin <jacques.f at videotron.ca>
>>> Date: Tuesday, June 16, 2026 at 11:21?AM
>>> To: 'Jordan Arndt' <Outposter30 at shaw.ca>; 'PAUL ROCHE' <rochep at comcast.net>; r-390 at mailman.qth.net <r-390 at mailman.qth.net>
>>> Subject: RE: [R-390] Removing Megacycle Change shaft
>>>
>>> Hi Jordan,
>>> Not sure about this clamp ID, but it must have a 13/32" hole to fit the gear
>>> part that it have to hold to the shaft.
>>> See attached picture.
>>> The ultimate problem that Paul is facing will be to remove the broken clamp
>>> there without damaging anything else around.
>>> Using a two-part clamp is a good idea, medium hard to machine, but there can
>>> be other hidden mechanical damages in his set.
>>> We never know what happened to these radios before.
>>> To maintain (or restore) those requires both electrical and mechanical
>>> skills.
>>>
>>> IMHO, Paul should attempt a gearbox disassembly, cleaning and reassembly
>>> (Y2K-R3a manual Chapter 10).
>>> At least, he will be able to catch any other marginal mechanical flaw within
>>> during the process.
>>> This is one of the worst case I seen so far: a clamp broken at the worst
>>> possible place, but.. any other broken clamp within the gearbox will require
>>> disassembly, anyways.
>>>
>>> There is other "stupid" damages I was able to see in my "spare" EAC RF deck
>>> yesterday night: some of the clamp screws heads are "eaten" internally, most
>>> probably because someone tried to use Allen bits instead of Bristol ones on
>>> those.
>>> That one will be due for a complete overhaul, I believe: it is completely
>>> gummed up, also.
>>>
>>> PAUL: just a comment...
>>> The answers you provided came to me OK directly to my email address, but the
>>> same text did not "passed" thru the forum: the postings came to me "empty".
>>> I cannot tell why, but have a check...
>>>
>>> 73, Jacques, VE2JFE in Montreal
>>> ______________________________________________________________
>>> R-390 mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:R-390 at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> ______________________________________________________________
>>> R-390 mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:R-390 at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>
>
> ------------------------------
>
> Message: 3
> Date: Tue, 16 Jun 2026 13:13:51 -0400
> From: "Jacques Fortin" <jacques.f at videotron.ca>
> To: "'Fred Moore'" <fred_moore at usa.net>, "'robert meadows'"
> <rpmeadow at bellsouth.net>, "'R390A'" <r-390 at mailman.qth.net>, "'Tisha
> Hayes'" <tisha.hayes at gmail.com>
> Subject: Re: [R-390] Weird looking set screws
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="US-ASCII"
>
> Hi Fred,
> IF EVER you found a valid source for the Bristol ones, let us know !
> Allen head ones are more easy to find...
> Use the largest head recess size (3/32").
> But resist the temptation to buy the Stainless Steel ones: these are less
> "tough" than the black oxide coated steel ones...
> And for the square nuts... I already "made" some from standard 1/4" hex
> nuts.
> File or grind those on three sides. I prefer brass to the steel ones
> however...
>
> 73, Jacques, VE2JFE in Montreal
>
> Aha! I'm looking for six to ten of the 4-40 x 1/2 inch Bristol socket head
> cap screws for the BFO and BW shaft clamps. One square nut (if available)
> would be helpful as well. If not, I'm sure there would be Allen head screws
> at my local hardware store.
> But What didn't work for the ham I got his from was a mix of slotted and
> Phillips screws -- the heads wore out quickly.
> -Fred
>
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 16 Jun 2026 17:18:14 -0000
> From: "Fred Moore" <fred_moore at usa.net>
> To: "Jacques Fortin" <jacques.f at videotron.ca>, "'robert meadows'"
> <rpmeadow at bellsouth.net>, "'R390A'" <r-390 at mailman.qth.net>, "'Tisha
> Hayes'" <tisha.hayes at gmail.com>
> Subject: Re: [R-390] Weird looking set screws
> Message-ID: <476EFPRRo0512Set.1781630294 at web08.cms.usa.net>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Thanks Jacques, I will do exactly that. I think, too, I will put a TZ-Tape
> label on the front edge of the IF that they are Allen head, so as not to trap
> the unwary. -Fre4d
>
> ------ Original Message ------
> Received: Tue, 16 Jun 2026 05:13:59 PM GMT
> From: "Jacques Fortin" <jacques.f at videotron.ca>
> To: "'Fred Moore'" <fred_moore at usa.net>, "'robert meadows'"
> <rpmeadow at bellsouth.net>, "'R390A'" <r-390 at mailman.qth.net>, "'Tisha Hayes'"
> <tisha.hayes at gmail.com>
> Subject: RE: [R-390] Weird looking set screws
>
> Hi Fred,
> IF EVER you found a valid source for the Bristol ones, let us know !
> Allen head ones are more easy to find...
> Use the largest head recess size (3/32").
> But resist the temptation to buy the Stainless Steel ones: these are less
> "tough" than the black oxide coated steel ones...
> And for the square nuts... I already "made" some from standard 1/4" hex
> nuts.
> File or grind those on three sides. I prefer brass to the steel ones
> however...
>
> 73, Jacques, VE2JFE in Montreal
>
> Aha! I'm looking for six to ten of the 4-40 x 1/2 inch Bristol socket head
> cap screws for the BFO and BW shaft clamps. One square nut (if available)
> would be helpful as well. If not, I'm sure there would be Allen head screws
> at my local hardware store.
> But What didn't work for the ham I got his from was a mix of slotted and
> Phillips screws -- the heads wore out quickly.
> -Fred
>
>
>
>
>
> ------------------------------
>
> Message: 5
> Date: Tue, 16 Jun 2026 13:20:46 -0400 (EDT)
> From: Barry <n4buq at knology.net>
> To: Jacques Fortin <jacques.f at videotron.ca>
> Cc: R-390 Mailing List <r-390 at mailman.qth.net>
> Subject: Re: [R-390] Removing Megacycle Change shaft
> Message-ID:
> <1600007746.3175405.1781630446452.JavaMail.zimbra at knology.net>
> Content-Type: text/plain; charset=utf-8
>
> Now that I'm looking directly at the underside of my R390, it's unfortunate that they changed that assembly for the R390A. That clamp easily comes off from the front in the earlier model.
>
> Good luck with it. The R390A's RF deck isn't really that difficult to remove. It would make any gear cleaning/lubricating a bit easier should you choose to do so.
>
> Since I don't have an R390A I can't tell but is that grip ring on the back of the gearbox all that difficult to remove with the geartrain in place? If not, then once the pin is removed from that collar, it might be the easiest to do it that way and the clamp would be easier to remove as well. I realize it would most likely require a 90-degree grip ring plier with short prongs, etc. Just a thought...
>
> Good luck with it.
> Barry - N4BUQ
>
>> Hi Jordan,
>> Not sure about this clamp ID, but it must have a 13/32" hole to fit the gear
>> part that it have to hold to the shaft.
>> See attached picture.
>> The ultimate problem that Paul is facing will be to remove the broken clamp
>> there without damaging anything else around.
>> Using a two-part clamp is a good idea, medium hard to machine, but there can
>> be other hidden mechanical damages in his set.
>> We never know what happened to these radios before.
>> To maintain (or restore) those requires both electrical and mechanical
>> skills.
>>
>> IMHO, Paul should attempt a gearbox disassembly, cleaning and reassembly
>> (Y2K-R3a manual Chapter 10).
>> At least, he will be able to catch any other marginal mechanical flaw within
>> during the process.
>> This is one of the worst case I seen so far: a clamp broken at the worst
>> possible place, but.. any other broken clamp within the gearbox will require
>> disassembly, anyways.
>>
>> There is other "stupid" damages I was able to see in my "spare" EAC RF deck
>> yesterday night: some of the clamp screws heads are "eaten" internally, most
>> probably because someone tried to use Allen bits instead of Bristol ones on
>> those.
>> That one will be due for a complete overhaul, I believe: it is completely
>> gummed up, also.
>>
>> PAUL: just a comment...
>> The answers you provided came to me OK directly to my email address, but the
>> same text did not "passed" thru the forum: the postings came to me "empty".
>> I cannot tell why, but have a check...
>>
>> 73, Jacques, VE2JFE in Montreal
>>
>> ______________________________________________________________
>> R-390 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:R-390 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>
> ------------------------------
>
> Message: 6
> Date: Tue, 16 Jun 2026 10:28:35 -0700
> From: Renee K6FSB <k6fsb.1 at gmail.com>
> To: Jacques Fortin <jacques.f at videotron.ca>, 'Fred Moore'
> <fred_moore at usa.net>, 'robert meadows' <rpmeadow at bellsouth.net>,
> 'R390A' <r-390 at mailman.qth.net>, 'Tisha Hayes' <tisha.hayes at gmail.com>
> Subject: Re: [R-390] Weird looking set screws
> Message-ID: <08afc097-f4b7-868e-7ace-4eab108b8c73 at gmail.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> might i suggest next best thing to Bristol spline would be torx which
> are not too difficult to obtain and much less chance of cam-out than allen.
> Ren?e, K6FSB
>
>
>> On 6/16/26 10:13 AM, Jacques Fortin via R-390 wrote:
>> Hi Fred,
>> IF EVER you found a valid source for the Bristol ones, let us know !
>> Allen head ones are more easy to find...
>> Use the largest head recess size (3/32").
>> But resist the temptation to buy the Stainless Steel ones: these are less
>> "tough" than the black oxide coated steel ones...
>> And for the square nuts... I already "made" some from standard 1/4" hex
>> nuts.
>> File or grind those on three sides. I prefer brass to the steel ones
>> however...
>>
>> 73, Jacques, VE2JFE in Montreal
>>
>> Aha! I'm looking for six to ten of the 4-40 x 1/2 inch Bristol socket head
>> cap screws for the BFO and BW shaft clamps. One square nut (if available)
>> would be helpful as well. If not, I'm sure there would be Allen head screws
>> at my local hardware store.
>> But What didn't work for the ham I got his from was a mix of slotted and
>> Phillips screws -- the heads wore out quickly.
>> -Fred
>>
>> ______________________________________________________________
>> R-390 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:R-390 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>
>
> ------------------------------
>
> Message: 7
> Date: Tue, 16 Jun 2026 17:31:04 -0000
> From: "Fred Moore" <fred_moore at usa.net>
> To: <k6fsb at arrl.net>, Jacques Fortin <jacques.f at videotron.ca>, 'Fred
> Moore' <fred_moore at usa.net>, 'robert meadows'
> <rpmeadow at bellsouth.net>, 'R390A' <r-390 at mailman.qth.net>, 'Tisha
> Hayes' <tisha.hayes at gmail.com>
> Subject: Re: [R-390] Weird looking set screws
> Message-ID: <553EFPREe5328Set.1781631064 at web02.cms.usa.net>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Thanks Renee! -Fred
>
> ------ Original Message ------
> Received: Tue, 16 Jun 2026 05:29:01 PM GMT
> From: Renee K6FSB <k6fsb.1 at gmail.com>
> To: Jacques Fortin <jacques.f at videotron.ca>, 'Fred Moore'
> <fred_moore at usa.net>, 'robert meadows' <rpmeadow at bellsouth.net>, 'R390A'
> <r-390 at mailman.qth.net>, 'Tisha Hayes' <tisha.hayes at gmail.com>
> Subject: Re: [R-390] Weird looking set screws
>
> might i suggest next best thing to Bristol spline would be torx which
> are not too difficult to obtain and much less chance of cam-out than allen.
> Ren?e, K6FSB
>
>
>> On 6/16/26 10:13 AM, Jacques Fortin via R-390 wrote:
>> Hi Fred,
>> IF EVER you found a valid source for the Bristol ones, let us know !
>> Allen head ones are more easy to find...
>> Use the largest head recess size (3/32").
>> But resist the temptation to buy the Stainless Steel ones: these are less
>> "tough" than the black oxide coated steel ones...
>> And for the square nuts... I already "made" some from standard 1/4" hex
>> nuts.
>> File or grind those on three sides. I prefer brass to the steel ones
>> however...
>>
>> 73, Jacques, VE2JFE in Montreal
>>
>> Aha! I'm looking for six to ten of the 4-40 x 1/2 inch Bristol socket head
>> cap screws for the BFO and BW shaft clamps. One square nut (if available)
>> would be helpful as well. If not, I'm sure there would be Allen head
> screws
>> at my local hardware store.
>> But What didn't work for the ham I got his from was a mix of slotted and
>> Phillips screws -- the heads wore out quickly.
>> -Fred
>>
>> ______________________________________________________________
>> R-390 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:R-390 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>
>
>
>
>
> ------------------------------
>
> Message: 8
> Date: Tue, 16 Jun 2026 11:36:26 -0600
> From: "Jordan Arndt" <Outposter30 at shaw.ca>
> To: "Jacques Fortin" <jacques.f at videotron.ca>, "'Fred Moore'"
> <fred_moore at usa.net>, "'robert meadows'" <rpmeadow at bellsouth.net>,
> "'R390A'" <r-390 at mailman.qth.net>, "'Tisha Hayes'"
> <tisha.hayes at gmail.com>
> Subject: Re: [R-390] Weird looking set screws
> Message-ID: <5C025840CD63446D8BE94599F3A49A31 at Jordan1>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> I've got 14 of the smaller clamps with the original Bristol hardware and
> square nut installed, but I have no idea of their value...I'd have to figure
> that out...
> 73...Jordan VE6ZT
>
>
> ----- Original Message -----
> From: "Jacques Fortin via R-390" <r-390 at mailman.qth.net>
> To: "'Fred Moore'" <fred_moore at usa.net>; "'robert meadows'"
> <rpmeadow at bellsouth.net>; "'R390A'" <r-390 at mailman.qth.net>; "'Tisha Hayes'"
> <tisha.hayes at gmail.com>
> Sent: Tuesday, June 16, 2026 11:13 AM
> Subject: Re: [R-390] Weird looking set screws
>
>
>> Hi Fred,
>> IF EVER you found a valid source for the Bristol ones, let us know !
>> Allen head ones are more easy to find...
>> Use the largest head recess size (3/32").
>> But resist the temptation to buy the Stainless Steel ones: these are less
>> "tough" than the black oxide coated steel ones...
>> And for the square nuts... I already "made" some from standard 1/4" hex
>> nuts.
>> File or grind those on three sides. I prefer brass to the steel ones
>> however...
>>
>> 73, Jacques, VE2JFE in Montreal
>>
>> Aha! I'm looking for six to ten of the 4-40 x 1/2 inch Bristol socket
>> head
>> cap screws for the BFO and BW shaft clamps. One square nut (if available)
>> would be helpful as well. If not, I'm sure there would be Allen head
>> screws
>> at my local hardware store.
>> But What didn't work for the ham I got his from was a mix of slotted and
>> Phillips screws -- the heads wore out quickly.
>> -Fred
>>
>> ______________________________________________________________
>> R-390 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:R-390 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>
>
> ------------------------------
>
> Message: 9
> Date: Tue, 16 Jun 2026 13:36:41 -0400
> From: "Jacques Fortin" <jacques.f at videotron.ca>
> To: "'Nick England'" <nick at navy-radio.com>
> Cc: 'R390A' <r-390 at mailman.qth.net>
> Subject: Re: [R-390] Removing Megacycle Change shaft
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="utf-8"
>
> Yes, exactly that !
> See attached picture: close to 7/16".
>
> 73, Jacques, VE2JFE in Montreal
>
> Hello Nick,
> Good try, but the hole on this one is too big (0.435) the one to be replaced measures 13/32" (0.406).
> Maybe the 0.435 ones are for the Kc and Mc knobs, I will check.
>
> 73, Jacques, VE2JFE in Montreal
>
> Maybe the clamp in question is this one?
> https://www.navy-radio.com/rcvrs/r390a/drawings/17310-00/00-85-SM-B-170763-CLAMP.pdf
> Nick England K4NYW
> Chapel Hill NC
> www.navy-radio.com
> -------------- next part --------------
> A non-text attachment was scrubbed...
> Name: IMG_5126.JPG
> Type: image/jpeg
> Size: 2135793 bytes
> Desc: not available
> URL: <http://mailman.qth.net/pipermail/r-390/attachments/20260616/46146add/attachment-0001.jpe>
>
> ------------------------------
>
> Message: 10
> Date: Tue, 16 Jun 2026 12:37:59 -0500
> From: Tisha Hayes <tisha.hayes at gmail.com>
> To: k6fsb at arrl.net
> Cc: Jacques Fortin <jacques.f at videotron.ca>, R390A
> <r-390 at mailman.qth.net>
> Subject: Re: [R-390] Weird looking set screws
> Message-ID:
> <CAACTF10CiEixCXPrM9PW_Mj-kMYkq6aGW_gFV4-TZz+F=f6rSA at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Yes, those Bristol-Spline screws are almost unreasonably durable; You can
> torque them to incredible levels and you would almost be certain that the
> screw would shear off. The black-oxide ones do seem tougher.
>
> Torx would be a good replacement, maybe not as high of a torque-out rating
> but probably more than enough for the application in a radio.
>
> About 15 years ago I bought up a bunch of the shaft-collars and
> Bristol-Spline screws from FairRadio and I know that I received them. I
> used them on two restorations where the hardware was broken/missing. For
> the life of me I cannot find any of the ones I thought I had left.
>
> If someone had been around during the St. Juliens Massacre (when so many
> R-390/ 390a's were left to rot) that would of been an excellent source for
> an unlimited amount of impossible to find hardware (along with the
> mini-BNC's, connectors, plugs, oscillator modules, crystals and slug racks).
>
> *Ms. Tisha Hayes, AA4HA*
>
>
>
>
>> On Tue, Jun 16, 2026 at 12:28?PM Renee K6FSB <k6fsb.1 at gmail.com> wrote:
>>
>> might i suggest next best thing to Bristol spline would be torx which are
>> not too difficult to obtain and much less chance of cam-out than allen.
>> Ren?e, K6FSB
>>
>>
>> On 6/16/26 10:13 AM, Jacques Fortin via R-390 wrote:
>>
>> Hi Fred,
>> IF EVER you found a valid source for the Bristol ones, let us know !
>> Allen head ones are more easy to find...
>> Use the largest head recess size (3/32").
>> But resist the temptation to buy the Stainless Steel ones: these are less
>> "tough" than the black oxide coated steel ones...
>> And for the square nuts... I already "made" some from standard 1/4" hex
>> nuts.
>> File or grind those on three sides. I prefer brass to the steel ones
>> however...
>>
>> 73, Jacques, VE2JFE in Montreal
>>
>> Aha! I'm looking for six to ten of the 4-40 x 1/2 inch Bristol socket head
>> cap screws for the BFO and BW shaft clamps. One square nut (if available)
>> would be helpful as well. If not, I'm sure there would be Allen head screws
>> at my local hardware store.
>> But What didn't work for the ham I got his from was a mix of slotted and
>> Phillips screws -- the heads wore out quickly.
>> -Fred
>>
>> ______________________________________________________________
>> R-390 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:R-390 at mailman.qth.net <R-390 at mailman.qth.net>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>>
>
>
> ------------------------------
>
> Message: 11
> Date: Tue, 16 Jun 2026 18:31:50 +0000 (UTC)
> From: robert meadows <rpmeadow at bellsouth.net>
> To: "k6fsb at arrl.net" <k6fsb at arrl.net>, Tisha Hayes
> <tisha.hayes at gmail.com>
> Cc: Jacques Fortin <jacques.f at videotron.ca>, R390A
> <r-390 at mailman.qth.net>
> Subject: Re: [R-390] Weird looking set screws
> Message-ID: <380431867.994167.1781634710740 at mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
> McMaster? Carr ha s all you can stand, as well as correct wrenches.
> R
> On Tuesday, June 16, 2026 at 01:38:37 PM EDT, Tisha Hayes <tisha.hayes at gmail.com> wrote:
>
> Yes, those Bristol-Spline screws are almost unreasonably durable; You can torque them to incredible levels and you would almost be certain that the screw would shear off. The black-oxide ones do seem tougher.
> Torx would be a good replacement, maybe not as high of a torque-out rating but probably more than enough for the application in a radio.
> About 15 years ago I bought up a bunch of the shaft-collars and Bristol-Spline screws from FairRadio and I know?that I received them. I used them on two restorations where the?hardware was broken/missing. For the life of me I cannot find any of the ones I thought I had left.
> If someone had been around during the St. Juliens Massacre (when so many R-390/ 390a's were left to rot) that would of been an excellent source for an unlimited amount of impossible to find hardware (along with the mini-BNC's, connectors, plugs, oscillator modules, crystals and slug racks).
> Ms. Tisha Hayes, AA4HA
>
>
>
> On Tue, Jun 16, 2026 at 12:28?PM Renee K6FSB <k6fsb.1 at gmail.com> wrote:
>
> might i suggest next best thing to Bristol spline would be torx which are not too difficult to obtain and much less chance of cam-out than allen.
> Ren?e, K6FSB
>
>
> On 6/16/26 10:13 AM, Jacques Fortin via R-390 wrote:
>
> Hi Fred,
> IF EVER you found a valid source for the Bristol ones, let us know !
> Allen head ones are more easy to find...
> Use the largest head recess size (3/32").
> But resist the temptation to buy the Stainless Steel ones: these are less
> "tough" than the black oxide coated steel ones...
> And for the square nuts... I already "made" some from standard 1/4" hex
> nuts.
> File or grind those on three sides. I prefer brass to the steel ones
> however...
>
> 73, Jacques, VE2JFE in Montreal
>
> Aha! I'm looking for six to ten of the 4-40 x 1/2 inch Bristol socket head
> cap screws for the BFO and BW shaft clamps. One square nut (if available)
> would be helpful as well. If not, I'm sure there would be Allen head screws
> at my local hardware store.
> But What didn't work for the ham I got his from was a mix of slotted and
> Phillips screws -- the heads wore out quickly.
> -Fred
>
> ______________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:R-390 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
>
>
>
> ------------------------------
>
> Message: 12
> Date: Tue, 16 Jun 2026 12:06:18 -0700
> From: Edward Zeranski <edzeranski at cox.net>
> To: k6fsb at arrl.net, Renee K6FSB <k6fsb.1 at gmail.com>
> Cc: Jacques Fortin <jacques.f at videotron.ca>, R390A
> <r-390 at mailman.qth.net>, Tisha Hayes <tisha.hayes at gmail.com>
> Subject: Re: [R-390] Weird looking set screws
> Message-ID: <2DA15479-CFAB-4FAF-86D5-03615263C413 at cox.net>
> Content-Type: text/plain; charset=utf-8
>
> Have you looked at McMaster Carr or Granger? When I was working we bought Bristol/Bristo wrenches from them. Also do a search for TechniTool in PA.
> EdZ KG6UTS
>
> Sent from my iPhone
>
>> On Jun 16, 2026, at 10:28, Renee K6FSB via R-390 <r-390 at mailman.qth.net> wrote:
>>
>> ?might i suggest next best thing to Bristol spline would be torx which are not too difficult to obtain and much less chance of cam-out than allen.
>> Ren?e, K6FSB
>>
>>
>>>> On 6/16/26 10:13 AM, Jacques Fortin via R-390 wrote:
>>> Hi Fred,
>>> IF EVER you found a valid source for the Bristol ones, let us know !
>>> Allen head ones are more easy to find...
>>> Use the largest head recess size (3/32").
>>> But resist the temptation to buy the Stainless Steel ones: these are less
>>> "tough" than the black oxide coated steel ones...
>>> And for the square nuts... I already "made" some from standard 1/4" hex
>>> nuts.
>>> File or grind those on three sides. I prefer brass to the steel ones
>>> however...
>>>
>>> 73, Jacques, VE2JFE in Montreal
>>>
>>> Aha! I'm looking for six to ten of the 4-40 x 1/2 inch Bristol socket head
>>> cap screws for the BFO and BW shaft clamps. One square nut (if available)
>>> would be helpful as well. If not, I'm sure there would be Allen head screws
>>> at my local hardware store.
>>> But What didn't work for the ham I got his from was a mix of slotted and
>>> Phillips screws -- the heads wore out quickly.
>>> -Fred
>>>
>>> ______________________________________________________________
>>> R-390 mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:R-390 at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>
>> ______________________________________________________________
>> R-390 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:R-390 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>
>
> ------------------------------
>
> Message: 13
> Date: Tue, 16 Jun 2026 16:35:09 -0400
> From: Paul Roche <rochep at comcast.net>
> To: Jacques Fortin <jacques.f at videotron.ca>
> Cc: R390A <r-390 at mailman.qth.net>
> Subject: Re: [R-390] Removing Megacycle Change shaft
> Message-ID: <853051EB-1E99-4299-A185-B300433AAF7C at comcast.net>
> Content-Type: text/plain; charset=utf-8
>
> When I reply to all on email I was told there is no VK tent and when I try to respond to a post online I get an error message can I not ?reply to all? from my phone?
> Sent from my iPhone
>
>> On Jun 16, 2026, at 1:37?PM, Jacques Fortin via R-390 <r-390 at mailman.qth.net> wrote:
>>
>> ?Yes, exactly that !
>> See attached picture: close to 7/16".
>>
>> 73, Jacques, VE2JFE in Montreal
>>
>> Hello Nick,
>> Good try, but the hole on this one is too big (0.435) the one to be replaced measures 13/32" (0.406).
>> Maybe the 0.435 ones are for the Kc and Mc knobs, I will check.
>>
>> 73, Jacques, VE2JFE in Montreal
>>
>> Maybe the clamp in question is this one?
>> https://www.navy-radio.com/rcvrs/r390a/drawings/17310-00/00-85-SM-B-170763-CLAMP.pdf
>> Nick England K4NYW
>> Chapel Hill NC
>> www.navy-radio.com
>> <IMG_5126.JPG>
>> ______________________________________________________________
>> R-390 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:R-390 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>
>
> ------------------------------
>
> Message: 14
> Date: Tue, 16 Jun 2026 16:36:01 -0500
> From: Dave Merrill <r390a.urr at gmail.com>
> Cc: Jacques Fortin <jacques.f at videotron.ca>, R390A
> <r-390 at mailman.qth.net>, k6fsb at arrl.net, Tisha Hayes
> <tisha.hayes at gmail.com>
> Subject: Re: [R-390] Weird looking set screws
> Message-ID:
> <CAGRTi8Xc4J+M5VM8KvPvNbpK4DKNSU-+e2-mX7sW7FTxchaopg at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> A couple of years ago I tried to locate any supplier of Bristol screws and
> was very disappointed to find that they have been out of production for
> decades and the tooling to make them is also gone.
>
> You can have them made but the upfront costs are sky high and out of reach
> for hobbists.
>
> --... ...-- Dave N9ZC
>
>
> ------------------------------
>
> Message: 15
> Date: Tue, 16 Jun 2026 21:51:00 -0000
> From: "Fred Moore" <fred_moore at usa.net>
> To: robert meadows <rpmeadow at bellsouth.net>, "k6fsb at arrl.net"
> <k6fsb at arrl.net>, Tisha Hayes <tisha.hayes at gmail.com>
> Cc: Jacques Fortin <jacques.f at videotron.ca>, R390A
> <r-390 at mailman.qth.net>
> Subject: Re: [R-390] Weird looking set screws
> Message-ID: <560EFPVYa5328Set.1781646660 at web02.cms.usa.net>
> Content-Type: text/plain; charset=UTF-8
>
> Hi Robert,
>
> Thank you. I have a set of Bristol wrenches. But as Jacques exclaimed,
> locating new Bristol head cap screws appears to be an impossibility. If
> found, they would be from a source selling flight-qualified fasteners. For
> example, this place in my home state: www.planepartsinc.com -- "We are the
> nuts and bolts of your plane needs." Doesn't that sound promising? But alas,
> no.
>
> I just picked up 10 of the black Allen head cap screws from Ace Hardware.
>
> -Fred
>
>
>
> ------ Original Message ------
> Received: Tue, 16 Jun 2026 06:32:08 PM GMT
> From: robert meadows <rpmeadow at bellsouth.net>
> To: "k6fsb at arrl.net" <k6fsb at arrl.net>, Tisha Hayes <tisha.hayes at gmail.com>Cc:
> Jacques Fortin <jacques.f at videotron.ca>, Fred Moore <fred_moore at usa.net>,
> R390A <r-390 at mailman.qth.net>
> Subject: Re: [R-390] Weird looking set screws
>
> McMaster? Carr ha s all you can stand, as well as correct wrenches.
> R
> On Tuesday, June 16, 2026 at 01:38:37 PM EDT, Tisha Hayes
> <tisha.hayes at gmail.com> wrote:
>
> Yes, those Bristol-Spline screws are almost unreasonably durable; You can
> torque them to incredible levels and you would almost be certain that the
> screw would shear off. The black-oxide ones do seem tougher.
> Torx would be a good replacement, maybe not as high of a torque-out rating but
> probably more than enough for the application in a radio.
> About 15 years ago I bought up a bunch of the shaft-collars and Bristol-Spline
> screws from FairRadio and I know?that I received them. I used them on two
> restorations where the?hardware was broken/missing. For the life of me I
> cannot find any of the ones I thought I had left.
> If someone had been around during the St. Juliens Massacre (when so many
> R-390/ 390a's were left to rot) that would of been an excellent source for an
> unlimited amount of impossible to find hardware (along with the mini-BNC's,
> connectors, plugs, oscillator modules, crystals and slug racks).
> Ms. Tisha Hayes, AA4HA
>
>
>
> On Tue, Jun 16, 2026 at 12:28?PM Renee K6FSB <k6fsb.1 at gmail.com> wrote:
>
> might i suggest next best thing to Bristol spline would be torx which are
> not too difficult to obtain and much less chance of cam-out than allen.
> Ren?e, K6FSB
>
>
> On 6/16/26 10:13 AM, Jacques Fortin via R-390 wrote:
>
> Hi Fred,
> IF EVER you found a valid source for the Bristol ones, let us know !
> Allen head ones are more easy to find...
> Use the largest head recess size (3/32").
> But resist the temptation to buy the Stainless Steel ones: these are less
> "tough" than the black oxide coated steel ones...
> And for the square nuts... I already "made" some from standard 1/4" hex
> nuts.
> File or grind those on three sides. I prefer brass to the steel ones
> however...
>
> 73, Jacques, VE2JFE in Montreal
>
> Aha! I'm looking for six to ten of the 4-40 x 1/2 inch Bristol socket head
> cap screws for the BFO and BW shaft clamps. One square nut (if available)
> would be helpful as well. If not, I'm sure there would be Allen head screws
> at my local hardware store.
> But What didn't work for the ham I got his from was a mix of slotted and
> Phillips screws -- the heads wore out quickly.
> -Fred
>
> ______________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:R-390 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
>
>
>
>
>
>
> ------------------------------
>
> Message: 16
> Date: Tue, 16 Jun 2026 21:58:52 +0000 (UTC)
> From: robert meadows <rpmeadow at bellsouth.net>
> To: Dave Merrill <r390a.urr at gmail.com>
> Cc: Jacques Fortin <jacques.f at videotron.ca>, R390A
> <r-390 at mailman.qth.net>, "k6fsb at arrl.net" <k6fsb at arrl.net>, Tisha
> Hayes <tisha.hayes at gmail.com>
> Subject: Re: [R-390] Weird looking set screws
> Message-ID: <1432774509.8779.1781647132396 at mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
> I seem to remember speaking with the Bristol folks a year or so ago, and was advised, still available.R
> On Tuesday, June 16, 2026 at 05:36:25 PM EDT, Dave Merrill via R-390 <r-390 at mailman.qth.net> wrote:
>
> A couple of years ago I tried to locate any supplier of Bristol screws and
> was very disappointed to find that they have been out of production for
> decades and the tooling to make them is also gone.
>
> You can have them made but the upfront costs are sky high and out of reach
> for hobbists.
>
> --... ...-- Dave N9ZC
> ______________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:R-390 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
> ------------------------------
>
> Message: 17
> Date: Tue, 16 Jun 2026 18:15:03 -0400 (EDT)
> From: Barry <n4buq at knology.net>
> To: Robert Meadows <rpmeadow at bellsouth.net>
> Cc: Jacques Fortin <jacques.f at videotron.ca>, R-390 Mailing List
> <r-390 at mailman.qth.net>, k6fsb <k6fsb at arrl.net>, Tisha Hayes
> <tisha.hayes at gmail.com>
> Subject: Re: [R-390] Weird looking set screws
> Message-ID:
> <565480102.3694273.1781648103096.JavaMail.zimbra at knology.net>
> Content-Type: text/plain; charset=utf-8
>
> Apologies if this has already been mentioned, but these look somewhat promising. I have no idea, though, how much they'd cost or even if they're Bristol drive but the description sounds like they are.
>
> https://www.mwcomponents.com/shop/4-40x-250-sh-188-spl
>
> Barry - N4BUQ
>
>> I seem to remember speaking with the Bristol folks a year or so ago, and was
>> advised, still available.R
>> On Tuesday, June 16, 2026 at 05:36:25 PM EDT, Dave Merrill via R-390
>> <r-390 at mailman.qth.net> wrote:
>>
>> A couple of years ago I tried to locate any supplier of Bristol screws and
>> was very disappointed to find that they have been out of production for
>> decades and the tooling to make them is also gone.
>>
>> You can have them made but the upfront costs are sky high and out of reach
>> for hobbists.
>>
>> --... ...-- Dave N9ZC
>> ______________________________________________________________
>> R-390 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:R-390 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>> ______________________________________________________________
>> R-390 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:R-390 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>
> ------------------------------
>
> Message: 18
> Date: Tue, 16 Jun 2026 18:16:55 -0400 (EDT)
> From: Barry <n4buq at knology.net>
> To: Barry <n4buq at knology.net>
> Cc: Jacques Fortin <jacques.f at videotron.ca>, R-390 Mailing List
> <r-390 at mailman.qth.net>, k6fsb <k6fsb at arrl.net>, Tisha Hayes
> <tisha.hayes at gmail.com>
> Subject: Re: [R-390] Weird looking set screws
> Message-ID:
> <234228355.3696736.1781648215020.JavaMail.zimbra at knology.net>
> Content-Type: text/plain; charset=utf-8
>
> Rats. I just realized those are only 1/4" long so, even if they are Bristol spline drive, they're too short for this use.
>
> Barry - N4BUQ
>
>> Apologies if this has already been mentioned, but these look somewhat promising.
>> I have no idea, though, how much they'd cost or even if they're Bristol drive
>> but the description sounds like they are.
>>
>> https://www.mwcomponents.com/shop/4-40x-250-sh-188-spl
>>
>> Barry - N4BUQ
>>
>>> I seem to remember speaking with the Bristol folks a year or so ago, and was
>>> advised, still available.R
>>> On Tuesday, June 16, 2026 at 05:36:25 PM EDT, Dave Merrill via R-390
>>> <r-390 at mailman.qth.net> wrote:
>>>
>>> A couple of years ago I tried to locate any supplier of Bristol screws and
>>> was very disappointed to find that they have been out of production for
>>> decades and the tooling to make them is also gone.
>>>
>>> You can have them made but the upfront costs are sky high and out of reach
>>> for hobbists.
>>>
>>> --... ...-- Dave N9ZC
>>> ______________________________________________________________
>>> R-390 mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:R-390 at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>>
>>> ______________________________________________________________
>>> R-390 mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:R-390 at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>> ______________________________________________________________
>> R-390 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:R-390 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>
> ------------------------------
>
> Message: 19
> Date: Tue, 16 Jun 2026 22:08:36 -0400
> From: "Jacques Fortin" <jacques.f at videotron.ca>
> To: "'Nick England'" <nick at navy-radio.com>
> Cc: 'R390A' <r-390 at mailman.qth.net>
> Subject: Re: [R-390] Removing Megacycle Change shaft
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="us-ascii"
>
> Here is the needed clamp.
>
> 73, Jacques, VE2JFE in Montreal
>
> Hello Nick,
> Good try, but the hole on this one is too big (0.435) the one to be replaced
> measures 13/32" (0.406).
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> ------------------------------
>
> Message: 20
> Date: Tue, 16 Jun 2026 23:08:58 -0400
> From: Paul Roche <rochep at comcast.net>
> To: Jacques Fortin <jacques.f at videotron.ca>
> Cc: R390A <r-390 at mailman.qth.net>
> Subject: Re: [R-390] Removing Megacycle Change shaft
> Message-ID: <74F0ED32-3151-4E7A-9D87-11CDAEB6E689 at comcast.net>
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>
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>
> Sent from my iPhone
> I dont know if you can get see this. Now what? I see how to remove the KHZ gear but not sure about the clutch disk and the ?gear? above it.
>
> Paul
>> On Jun 16, 2026, at 10:09?PM, Jacques Fortin via R-390 <r-390 at mailman.qth.net> wrote:
>>
>> ?Here is the needed clamp.
>>
>> 73, Jacques, VE2JFE in Montreal
>>
>> Hello Nick,
>> Good try, but the hole on this one is too big (0.435) the one to be replaced
>> measures 13/32" (0.406).
>> <00-99-SM-B-178486-CLAMP.pdf>
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> End of R-390 Digest, Vol 263, Issue 11
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