[R-390] Weird looking set screws

[Renee K6FSB]

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.
Renée, 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