Pye Mk3 Television Camera focus drive modifications
A number of Pye Mk3 have had modifications to the servo-motor focus drive, replacing it with a mechanical drive.
This modification uses the original Pye knob to drive a rack & pinion gear, the rack being connected to a push-rod running the length of the camera in the bottom right hand corner. It then connects to the font of the tube yoke with a brass tab.