[R-390] knob set screws source

[Barry]

> yuh but--
>    The knob setscrews on the R-390's aren't the normal thread pitch, 
> they're 6-36 instead of the common 6-32.
>    from my archives:
> "McMaster even has the 8-36 hex-key socket screws to fit the R-390A front 
> panel knobs"
>    Somebody here had some taps a yr or 3 ago, I bought 1 or 2, for chasing 
> out the threads after painting or powder coating.
>  73,
> Al, W8UT

That's correct.  I doubt the hardware stores have that thread.  I have an 
8-32 tap I bought for the very same reasons.  I think I got it from 
Fastenal.

Barry - N4BUQ