tfarny said:
You don't need to ground switch parts or the backs of pots, actually - they are not part of the circuit.
I know what you mean, but each wiring diagram needs to be looked at on a case by case basis to see if the grounding is superfluous. True, pots and switches don't
need to be grounded, but sure enough there will be an instance where one end of the cap is soldered to the pot, and if that pot isn't grounded, that cap is doing nothing.