Singer 500 and 503 repair/ replacement parts. Needle clam assembly #172224 with set screw #189, collet #172066 and thread guide #172225. Complete unit. Price includes shipping to lower 48, return if fails on your Singer model 1000 Futura, 1000G, 1030, 1036, 1040G, 1060, 1060E, 1200, 1411, 1411N, 1411U, 1425G, 1425N, 1425U, 2001, 2001A, 2005, 2010 Futura, 2010 Touchtronic, 401, 401A, 403, 404, 417, 500, 503, 600, 600E Touch & Sew, 603, 604, 620, 620E, 620E31, 625, 626, 626E1, 626E6, 626E7, 628, 629, 630, 630E, 635, 635E, 636, 638, 639, 640 Touch & Sew, 640E, 645, 646, 648, 649, 6700 Series, 6704, 6705, 6800 Series, 714, 717E, 717 School, 719, 724, 734, 737, 750, 755, 756, 758, 770, 774, 775, 776, 778, 900 Futura, 900-3, 920, 920-3, 925, 925-3 Futura or Athena 2000 (2000A) restoration.