Fender amplifier volume knob

This is an exact replica of the knob that is used on the Fender Bassman amplifier, and probably other amplifiers too.It fits on standard potentiometers. The hole for the locking screw is 3.3 mm and ready to be tapered with a M4 taper tap.The slit on the top lines up with the knurling on the side, so you can fill it in with a black permanent marker nice and easy.