- Mar 23, 2008
I am working on a Seth Thomas Sonora clock and dealing with the chime mainspring for the first time. I have an Ollie Baker winder. Usually I hold the barrel with my hand to wind (unwind) a barrel mainspring, but Sonora chime mainspring is too strong. What is the usual process when dealing with such a mainspring? My largest mainspring holder (with U-shaped cutout) has an inner diameter of 2 1/8 inches - is that large enough to fit over this mainspring??