Singer Free Arm 57815C repair/ replacement parts.  Slide plate and zig zag throat plate #356713.   Used working parts.  Price includes shipping to lower 48, return for refund if fails on your Singer Model: 4620, 5017, 5028, 5040, 5050, 5605, 5610, 5705, 5710, 5802, 5805, 5806, 5808, 5810, 5812, 5814, 5816, 5817, 5818, 5820, 5825, 5830, 5838, 9802-9836, 9818, 9936, 57817, 57820, 57825, CG590, CM17, FM17, FM19, FM22, HD102, HD105, HD110 and SM14.