[R-390] Weird looking set screws

[Jordan Arndt]

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
>
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