Upper Thread Tension Assembly
Fits Singer industrial models: 107G, 107W, 107W1, 107W10, 107W14, 107W15, 107W3, 107W35, 107W50, 107W9, 108K, 108U20, 108U30, 108W, 108W20, 108W21, 110K, 110W, 136W, 140W, 143W, 151K, 151W, 307G, 457G, 457U, 46W, 47W, 47W61, 47W62, 47W63, 47W66, 51W, 51W54, 51W55, 51W56, 51W57, 51W59, 61W