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This tool is used for cleaning rust and burrs of parts like the Featherweight hook assembly, loop guard, the bobbin case, and the tension discs. The rubber honing stick will allow you to quickly and conveniently smooth out and polish any rough spots that would hinder the thread path. Simply take the stick and firmly rub back and forth on the rust or rough spots that need filing down.
The Rubber Honing Stick is made with an abrasive material, and while good for polishing areas on mechanical parts, it should not be used on any polished chrome parts like the faceplate, needle plate, or stop back motion knob.