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Showing results for tags 'diameters'.
I’m considering ordering a couple of Bergeon mainspring winders from CousinsUK, and I really want to get it right as these are expensive tools. The way I read it, the specified diameter of each winder is the outer diameter of the winder’s barrel drum. That is, I would need to order a winder having a smaller specified diameter than the inner diameter of the mainspring barrel I’m going to use it with? For example, if the inner diameter of my mainspring drum is 9.80 mm (as is the actual case) a Bergeon No.6 Winder Ø9.80mm would be too large, or just right, no, yes?