{"product_id":"bobbin-winder-springs-for-singer-500-503-rocketeer-parts-172552-172555","title":"Bobbin Winder Springs for Singer 500, 503 Rocketeer - Parts # 172552 \u0026 172555","description":"\u003cp\u003eThese bobbin winder springs are designed for Singer 500 and 503 Rocketeer sewing machines. The bobbin winder mechanism uses two springs to control the winding process: the return spring brings the winder back to its rest position after winding, while the release spring disengages the winder when the bobbin is full. These springs are essential for proper bobbin winding operation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReturn Spring Part Number: 172552\u003c\/li\u003e\n\u003cli\u003eRelease Spring Part Number: 172555\u003c\/li\u003e\n\u003cli\u003eType: Replacement (aftermarket)\u003c\/li\u003e\n\u003cli\u003eFunction: Controls bobbin winder engagement and return mechanism\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eAvailable Options:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReturn \u0026amp; Release Springs Set\u003c\/strong\u003e - Both springs (Part # 172552 \u0026amp; 172555)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReturn Spring\u003c\/strong\u003e - Part # 172552 only\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelease Spring\u003c\/strong\u003e - Part # 172555 only\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eMachine Compatibility:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFits Singer 500 Series (Rocketeer): 500, 500A, 503, 503A\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFunction \u0026amp; Benefits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe bobbin winder springs work together to ensure smooth, automatic bobbin winding. The return spring (172552) pulls the winder mechanism back to its rest position after winding is complete, while the release spring (172555) automatically disengages the winder when the bobbin reaches full capacity, preventing overwinding and thread breakage. Replace worn, broken, or missing springs to restore proper bobbin winding function.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eInstallation Note:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eReplace damaged, stretched, or missing bobbin winder springs to restore proper winding operation. Ensure springs are correctly installed in their designated positions for proper engagement and release function.\u003c\/p\u003e","brand":"PD Sixty","offers":[{"title":"Return \u0026 Release Springs #172552 \u0026 172555","offer_id":40888082235490,"sku":"172552-172555","price":12.99,"currency_code":"USD","in_stock":true},{"title":"Return Spring #172552","offer_id":40888082169954,"sku":"172552","price":6.89,"currency_code":"USD","in_stock":true},{"title":"Release Spring #172555","offer_id":40888082202722,"sku":"172555","price":6.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/4681\/files\/IMG_7212-Photoroom.jpg?v=1762525982","url":"https:\/\/www.vintagesingerparts.com\/products\/bobbin-winder-springs-for-singer-500-503-rocketeer-parts-172552-172555","provider":"Central Michigan Sewing Supplies","version":"1.0","type":"link"}