[R-390] Audio and BFO, pot repair

[Tisha Hayes]

You need to be careful with the conductive paint. If you get too much of it
on the potentiometer you could reduce the pot to a dead short.

Identifying exactly where the broken area is on the pot is very important.
If you do not have resistance from end to end *(two outer leads on the pot)
then the conductive trace is completely broken. I managed to save two pots
by dissecting them and cleaning them with DeOxIt on a cotton swab. Usually
this is all it takes to fix a wire-wound pot as they are more robust than
the "magic dust" glued to a piece of plastic of phenolic.

-- 
Ms. Tisha Hayes

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"I will not recant the truth. I am corn, not chaff; I will not be blown away
with the wind or burst by the flail. I will survive both."
-Walter Milne, 1558