Ollie Baker Chuck 3.75/4.00 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 3.75/4.00 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.