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I cant see why you couldn’t do it the same way you would replace a hook on a clock barrel arbor or barrel wall. Now I appreciate these watch mainspring winders are small but you should still be able to drill out the arbor where the old hook was, tap a hole and insert a screw using a bit of loctite. You can then using needle files shape the head of the screw. Obviously for the very small winders for ladies wristwatches it is a delicate operation but worthwhile if you look at the price of a new set and buying another set used you could just end up with the same problem. I will do one of mine tomorrow and report back.