[R-390] Odd MC/KC Knobs?

[Tim Shoppa]

"Dave Merrill" <r390a.urr at gmail.com> wrote:
> Ended item 150038869762 - maybe locally made?

They look like some kind of idler pulley to me, painted black.

Drill for 5/16" and put a setscrew in the sides, and viola!, knobs!

I'm not going to claim it's impossible to turn the MHz knob with
a smooth knob, but boy do those lobes come in handy...

Random 5/16" knobs aren't all that rare, a search at McMaster-Carr
turns up thousands of different types.

Tim.