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Tension spring indicator cup #20 to fit tension 422403-455. This cup also works with the tension release mechanism.
Alternate Part Numbers
20, 37987-406, 44879-472
Fits the following Singer sewing machine models
1247, 1263, 1280, 1288, 1802, 1803, 1812, 1852, 1862, 1872, 1873, 239, 240, 2404, 241, 242, 2430, 247, 247AP, 248, 250, 251, 252, 257, 258, 259, 288, 300, 3101, 3102, 3103, 3105, 3140, 347, 360, 400, 403, 4825, 4828, 4830, 500, 502, 507, 509, 513, 522, 527, 533, 543, 600, 603, 604, 6102, 6104, 6105, 6106, 6110, 6120, 6130, 6136, 6146, 6152, 6156, 6174, 6184, 620, 6201, 6202, 620E, 6211, 6212, 6214, 6215, 6217, 625, 626, 628, 629, 630, 630E, 635, 636, 638, 639, 640E, 645, 646, 649, 6606, 8734, 8834, 9900, 237