Vintage Singer sewing machine hand wheel stop motion knob set screw. This set screw is compatible with many models, including the class 15 (with exception of the 15-91), 66, 99, 127, 128, 185, 192, 201-3, 221 / 222K Featherweight, 306, 319, 327, 328, etc. Genuine, original Simanco Part #248