Watch Mainspring Winder

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Watch main spring winder closely. STL files are designed for 9mm barrel and 3mm arbor. You can easily modify shape with openscad file to suit your specific needs. This design could even be adapted for clocks if you desire. To utilize winder, you'll need to drill a small hole in the arbor and insert a wire to catch the end of the mainspring securely. Place plunger into handle first, then position mainspring onto winder. Next, attach handle to winder and begin turning slowly.