[R-390] Painting Knobs

[Barry]

Hi Dave, 

In that case, I presume the factory did not use a chromate conversion after all. 

Yes, the fingers are easily broken, that's for sure. Fortunately, all of mine are intact. 

The large knobs that Hank made before he passed were so nice! I wish someone else could take up that effort. I just don't have the tooling for it. 

Thanks again, 
Barry - N4BUQ 

> Hi Barry,

> Decades ago, I managed to track down a supplier who cast R-390 knobs. I wanted
> to see if the still had the molds for the Mc/Kc knobs since they were in short
> supply. The shaft tabs often broke due to the material used and the high
> torque, especially the Mc knob.

> After checking, they didn't have the molds anymore. The plant was being shut
> down by the EPA due to pollution by zinc and other metals.

> So I'm pretty sure the Mc/Kc knobs were cast from pot metal that included zinc.

> Dave N9ZC