I'm missing one of the nuts on the 1/4 input jack on my Hartke HyDrive Input jack. I'm not really sure if there is a specific name for it. It seems to be a black synthetic nut and very common/standard on Hartke HyDrive, Ampeg combo amps, Peavey Headliners, Peavey Combos. I have the same type of nut on some of my pedals. Again seems very common but I can't find a replacement. I don't know the thread size. (attached crappy cell pic to help). Any idea where I can get one? I've already tried - - Direct from Hartke - they don't have any - they will ship if they get one - Local independent music shop - GC - Local hardware shop - Lowes I don't have a local amp repair shop but will look around. Seems like it should be in someone's spare parts. Any help will be greatly appreciated.