Have you considered removing the knob and removing it from the board, and 
rebuilding the pot? Clean it all with contact cleaner/tv tuner cleaner, 
reassemble it.

I did this for some radio push buttons (the super long ones that turn on and 
off like 8 circuits) inside an old graphical equalizer and the thing is like 
new now. 


Sent from your iPhone.

> On Aug 12, 2017, at 1:14 AM, Ian McLaughlin <i...@platinum.net> wrote:
> Hello all,
> Does anyone have a suggestion for a replacement contrast potentiometer for a 
> model 100? I have a machine that was working until someone ‘over-adjusted’ 
> the contrast knob and it now spins freely, and therefore doesn’t work.  It’s 
> not a mechanical issue with the screw and the knob, but rather inside the 
> mechanism itself.
> I tried a quick scan of Digikey but I can’t find anything with remotely the 
> same form factor.  Wondering if anyone knows of a source for these, or has 
> managed a repair with a substitute?
> Thanks for any guidance.
> Ian

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