Control knob - Roller wheel for Jazzmaster/Jaguar rhythm circuit
These are made by AllParts and are the control wheels for the rhythm circuits on Jazzmasters and Jaguars. They fit 6.35mm shaft pots (primarily these mini pots) and are secured by a small grub screw. They have a fine knurl grip along the edges and are what appears to be plated brass judging by the weight of them.
These are supplied individually.