Singer Touch & Sew 638 repair/ replacement parts. Needle clamp assembly #163921 (includes needle clamp body, clamp thumb screw and gib) with thread guide #163431 and mounting screw #141453. Price includes shipping, Will work on most Touch & Sew 600/700 machines including: 600, 603, 604, 620, 620E, 625, 626, 628, 629, 630, 630E, 635, 636, 638, 639, 640E, 645, 646, 648, 649, 714, 717 School, 719, 724, 734, 737, 750, 755, 756, 758, 770, 774, 775, 776, 778.