This is a simple wheel to make it easier to adjust the bobbin tensioner(s) on your Chinese Leather Shoe Patcher. Optionally you can insert a leather ring with numbers stamped on it to indicate position, I've included a second stl for an easy template to make the leather insert.

Note that the pics I uploaded are an older version with a hexagonal inside part, since this made it harder to cut out the leather insert I revised it to be round for uploading here.

Printed on an old PrintrBot Simple metal, 0.3mm nozzle, 0.3mm layer height, 3 shells, 10% honeycomb infill. There isn't much stress on the part so it'll probably be fairly forgiving for print settings.

Included is the Sketchup Make 2017 file for you to remix if you want. Happy sewing!