{"product_id":"replacement-shuttle-hook-tension-spring-singer-part-8611-fits-29k-29u-cobbler-machines","title":"Replacement Shuttle Hook Tension Spring - Singer Part # 8611 - Fits 29K \u0026 29U Cobbler Machines","description":"\u003cp\u003eThis replacement shuttle hook tension spring (Part # 8611) is a new aftermarket component for Singer 29K and 29U industrial shoe patcher (cobbler) machines. A small, flexible metal plate that sits on the outside of the shuttle hook and regulates bobbin thread tension as it exits the bobbin for balanced stitch formation on leather and heavy materials.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePart #:\u003c\/strong\u003e 8611\u003cbr\u003e\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003cbr\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003cbr\u003e\u003cstrong\u003eType:\u003c\/strong\u003e Replacement (aftermarket)\u003c\/p\u003e\u003ch4\u003eWhen to Replace\u003c\/h4\u003e\u003cp\u003eReplace when you notice loose or skipped stitches, thread breakage, a visible wear groove on the spring, or loss of spring tension. Thread slides against this spring continuously during sewing — it is a standard maintenance item.\u003c\/p\u003e\u003ch4\u003eRelated Parts\u003c\/h4\u003e\u003cp\u003eRegulating Screw — Part # 662 (adjust after installing new spring)\u003cbr\u003eShuttle Hook — Part # 8603 (small bobbin)\u003c\/p\u003e\u003ch4\u003eCompatible Singer Models\u003c\/h4\u003e\u003cp\u003e29-1, 29K71, 29K73, 29K171, 29K171A, 29U171A, 29U173A\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Verify your model number and compare to the photos before ordering to confirm fitment.\u003c\/p\u003e\u003cem\u003eConfirm part compatibility with your specific machine before ordering. Part numbers and photos are your best reference.\u003c\/em\u003e","brand":"DMN","offers":[{"title":"Default Title","offer_id":42561563525218,"sku":"8611","price":3.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/4681\/files\/IMG_2430.jpg?v=1771004228","url":"https:\/\/www.vintagesingerparts.com\/products\/replacement-shuttle-hook-tension-spring-singer-part-8611-fits-29k-29u-cobbler-machines","provider":"Central Michigan Sewing Supplies","version":"1.0","type":"link"}