New replacement Singer sewing machine bobbin winder stop latch release spring. It is compatible with the following models: 15-86, 15-87, 15-88, 15-90, 15-91, 15-96, 15-97, 15-125, 201-2, 201-3, 306, 319 and the later model 99K with the waterslide decals such as the 99-28, 99-29, and 99-31. Part #125462, alternative part #66775 and #66610. Measures approx 7/16" in diameter.