[GreenKeys] Stunt Box Removal

Sun Mar 20 23:33:27 EDT 2022

For what it's worth, here’s a narrative describing how I removed the stunt
box from my Model 28 RO.  I was a total noob at this, but thanks to advice
I received from Greenkeys members (especially John Koster, W9DDD), it was
easier than I thought it would be.  With that being said, here we go:

First, I read the article by Irv Hoff in the May 1970 issue of RTTY Journal.
https://www.navy-radio.com/manuals/tty/stuntbox-rtty-7005.pdf     Then I
read the Teletype brochure about Stunt boxes:
https://www.navy-radio.com/manuals/tty/28SB-stunt-km4v.pdf    Those gave me
a good outline.

Referring to the annotated photo below, I did the following steps.

   1. I removed the homebrew “pull ups” at A.  Those pull ups disabled very
   odd features of my particular stunt box without my need to remove function
   bars (et al.) from the stunt box.  I removed the pull ups (after noting
   their particular slots) to ensure that when the stunt box was removed from
   the typing unit that things didn’t fall out of the stunt box.  I don’t
   know if this was absolutely necessary, but I did it anyway.

   1. I removed the c shaped retaining clip (at B) that holds the lever to
   the attachment on the horizontal rod, and then when the retaining clip
   sprang off the post it fell into the gear works.  Don’t do that.  Be
   careful that the c shaped retaining clip doesn’t fly away.  Once
   removed, put it in your parts cup, and don’t just leave the clip on your
   work surface.

   1. With the c shaped retaining clip (at B) removed, there wasn’t enough
   slop in the linkage of the lever to pop it off the post.  So I removed
   the screw (at E) to the left of where the lever attaches to the horizontal
   rod.  That screw is not a set screw – it is a through-the-rod retaining
   screw, so it had to come all the way out in order for me to slide that
   attachment to the left to release the lever from the post mount.
Once I slid
   it a little to the left so that the lever pops off the post, I then slid
   the attachment back into position and reinserted the screw.

   1. I then carefully rotated the *bottom* of the drive gear (at F) toward
   me, to move the main shaft in the normal direction of rotation (when viewed
   from the selector magnet end of the shaft the shaft will be rotating
   counter clockwise) until the lever that was attached at B was in its lowest
   position (so that the stunt box would clear the lever when the stunt box
   was removed from the typing unit).

   1. I then remove the screws at C and put them in my parts cup.  When the
   second screw was removed the Stunt box popped back toward me 3/8 of an inch
   or so.  At this point the stunt box was free to slide backwards toward
   me, with only two guide pins on either side holding it position via two
   track slots (at G).  I gently pulled the stunt box horizontally back
   towards me, maybe with a slight upward or downward motion.  I found that
   the right side came out easily, but the left side got hung up on the cables
   at D.  I had to move the cables a bit in order to get the stunt box to
   clear.

   1. Reinstalling the stunt box is pretty much the same procedure.  I
   started by inserting the stunt box such that the two guide pins on the left
   and right sides were in the guide slots, then gently pushed the stunt box
   forward (away from me), working around the cables at D.  When it was all
   the way in I think I pushed down a bit and the stunt box held in place (did
   not pop back) while I inserted the screws at C.  I then removed the
   through-the-rod screw (at B), slid the attachment slightly left, moved the
   connecting lever into position to go over the post on the attachment (I
   rotated the main shaft a bit by gently pulling the *bottom* of the main
   gear (at F) toward me to get the lever into proper position).  I then
   reinstalled the c retaining clip at B, then re-installed the
   through-the-rod screw (at E) to fix the attachment in place.  I then
   gently rotated the main shaft a few full revolutions (by gently
pulling the *bottom
   *of the main gear (at F) toward me) to ensure that nothing was binding
   and that there was no significant resistance while rotating the
shaft.  Finally,
   I reinstalled the pull-ups that I had removed in step 1.

As I was told by others before I started this project, once I had removed
and reinstalled the stunt box I’d feel that it wasn’t that big of a deal,
and I would now agree.  But without the Irv Hoff article and the specific
advice from Green Keys members, it would have been a lot more stressful and
more likely that I would have broken something.  My hope is that the
description above of how I removed the stunt box in my 28 RO may be useful
to others who are removing a stunt box for the first time from their
machine.

Paul - ad7i

[image: tty-stunt-back.jpg]

On Sun, Mar 20, 2022 at 6:14 PM Nick England <navy.radio at gmail.com> wrote:

> Just a note that I believe this article applies to Mark III printers. The
> Mark II is a bit different on the left end (left as you face the front of
> the machine), but not too hard to figure out.
> https://www.navy-radio.com/tty/28-mark.htm
>
> Nick England K4NYW
> www.navy-radio.com
>
>
> On Sun, Mar 20, 2022 at 12:44 PM Daniel Jones <djones at k6yic.com> wrote:
>
>> https://www.navy-radio.com/manuals/tty/stuntbox-rtty-7005.pdf
>>
>> Sent from my iPhone
>>
>> On Mar 20, 2022, at 09:36, Tom Hunter <tomhenryhunter at gmail.com> wrote:
>>
>> 
>> I am trying to download the May 1970 RTTY Journal
>> mentioned by AD7I.
>>
>> My ex-Navy Teletype repairman is hiding from me.
>> I have already fixed the keyboard and printer on my
>> 28 ASR that he gave up on.
>>
>> But now I need to get into the stuntbox on a KSR
>> by myself.
>>
>> I am wary of doing it for the first time. I would
>> very much like to read the article mentioned.
>>
>> I have searched and searched and and cannot
>> find that issue.
>>
>> If anyone could point me to it,
>> I would really appreciate it.
>>
>>
>> Tom   N3CRK
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>>
>>
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>>
>> >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
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>> >>> 2002-to-present greenkeys archive:
>> http://mailman.qth.net/pipermail/greenkeys/
>> >>> 1998-to-2001 greenkeys archive:
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>> >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
>> http://comcents.com/tty/greenkeyssearch.html
>>
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>> Please help support this email list: http://www.qsl.net/donate.html
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> ______________________________________________________________
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> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
> https://teletype.net/gksearch
> >>> 2002-to-present greenkeys archive:
> http://mailman.qth.net/pipermail/greenkeys/
> >>> 1998-to-2001 greenkeys archive:
> http://mailman.qth.net/archive/greenkeys/greenkeys.html
> >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
> http://comcents.com/tty/greenkeyssearch.html
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to ad7i at ad7i.net
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