Are you sure they are not Bristol spline screws? A hex (Allan) wrench of
a close size will turn loosely in a Bristol socket. Collins, Hallicrafters
and many industrial devices used Bristol screws. The splines are very hard
to see in the smaller types. They look like a worn out Allan socket. The
wrenches are readily available today from several vendors and the common
auction site.
Dave W7VM
On Thu, Jul 7, 2022 at 1:47 PM GD0TEP <gd0tep@manx.net> wrote:
> Hello to the group,
>
> I have a Command technologies VHF1200 6m amp.
>
> The amp itself is fine, but it's and I'm not the first owner, and I know it
> has seen some 'issues' over the years. Thus the covers have been off & on a
> few times. As such the screws are worn and I'd like to replace them. I'm
> talking about the little allan screws. They might be made of brass (or
> chocolate) as the allan holes are worn out, so they are next to useless.
>
> Does anyone know what thread size these might be please?
>
> 73
> Andy
> GD0TEP
>
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