A black metal wheel designed to be mounted on the shaft of the mini potentiometers that form the rhythm circuit in a jazzmaster. Only a small section is visible, which pokes out through the cut out in the pickguard / control plate, the rest of the wheel is under the pickguard / control plate along with the electronics. These have grub screws to fasten them onto the shafts of the two mini potentiometers typically found in Jazzmasters, and they should be used with solid shaft potentiometers.
Dimensions:Diameter: 25mm
Hole diameter: 6.5mm
Thickness: 6mm