Artie
Peaveyologist
I have a guitar with a very tight cavity and when I was tightening the washer, the whole pot turned a little pushing against the wall of the cavity and bending the hot tab into the one with the cap on it. Took me a while to find out why my tone pot wasn't doing anything.... Lol
I've done the same thing, except it was a cavity with that black conductive paint inside. The pot turned just a little, and hit the sidewall. Dead short to ground. No sound. Also took me awhile to find that.