Tension Spring Cup / Indicator - Singer Part # 422403-500
-Tension Spring Cup / Indicator
-Singer Part # 422403-500
-Works with tensioner 422403-455 and 507448
-Alternative part numbers 173669-011, 173669-453, 173669-701, 173669-930, 37987-408, 421739-451, 421739-456, 422403-500, 44879-461, 44879-478