Ollie Baker Chuck 4.25/4.50 mm attaches to the barrel arbor of the Ollie Baker style mainspring winder. Ollie Baker let-down chucks are used to wind and unwind clock mainsprings.
Ollie Baker Chuck 4.25/4.50 mm attaches to the barrel arbor of the Ollie Baker style mainspring winder. Ollie Baker let-down chucks are used to wind and unwind clock mainsprings.