Buttonholer Knob - Singer Part # 163721-656

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This replacement buttonholer knob (part # 163721-656) is specifically designed for Singer 600 Series Touch & Sew sewing machines. This control knob allows you to select and adjust buttonhole settings on your vintage Singer slant-needle machine. Specifications: Part Number: 163721-656 Type: Replacement (aftermarket) Designed for Singer 600 Series Touch & Sew Function: Buttonhole selection and adjustment Machine Compatibility: This part is specifically designed for the Singer 600 Series (Touch & Sew) and fits a wide range of models within that class: 620 Series: 620, 625, 626, 628, 629 630 Series: 630, 630E, 635, 635E, 636, 638, 639 640 Series: 640E, 645, 646, 648, 648E, 649 Show more