Singer457K Styllist repair/ replacement parts. Bobbin cover slide plate #179521 with friction spring and mounting screw. Plus zig zag throat plate #310703. Used working repair parts for Singer models: 240, 241, 242, 247, 247AP, 248, 249, 2404, 250, 252, 263, 288, 3100, 3101, 3102, 3103, 3105, 327, 327K, 328, 329, 337, 338, 347, 348, 353, 354, 360, 362, 366, 367, 413, 413K, 416, 416K, 418, 418K, 457, 457K, 466, 476 Stylist, 476K Stylist, 477, 478, 478K, 547, 563, 588, 7101, 9500, 9502, 9505, 9518. Price includes shipping to lower 48, return for refund if fails on your Singer.