COLLET KNOB Vintage UK Military (Large Diameter)NOS stored from new 1980
As used on Marconi & Plessey (& other makes).
A very well made, heavy duty control knob with a genuine "collet" chuck, tightened from a screw located underneath a removable cap on the knobs face (see pictures).
Believed to be of BAKALITE construction
Diameter: 62mm
Depth: 25mm
Lower body diameter: 40mm
Control Shaft diameter: 6.3mm max will clamp onto 6mm also