Ollie Baker Chuck 2.75/3.00 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 2.75/3.00 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.