{"product_id":"genuine-check-spring-twin-needle-70221-for-singer-144w-145w-and-seiko-jw-28bl-sewing-machines","title":"Check Spring Twin Needle 70221 for Singer 144W, 145W and Seiko JW-28BL Sewing Machines","description":"\u003cp\u003eCheck Spring (Twin Needle) 70221 for Singer 144W, 145W \u0026amp; Seiko JW-28BL Sewing Machines\u003cbr\u003e\nMaintain precise thread control and smooth stitch formation with this twin needle check spring, designed for Singer 144W, 145W, and Seiko JW-28BL industrial sewing machines. This essential tension component helps regulate upper thread movement during needle operation, ensuring balanced tension, reduced slack, and consistent stitch quality—especially in twin-needle applications.\u003cbr\u003e\nKey Features:\u003c\/p\u003e\n\n\n\u003cp\u003e?? replacement part – 70221\u003c\/p\u003e\n\n\n\u003cp\u003e?? Compatible with Singer 144W, 145W \u0026amp; Seiko JW-28BL models (Singer parts listing)\u003c\/p\u003e\n\n\n\u003cp\u003e?? Designed specifically for twin-needle tension control\u003c\/p\u003e\n\n\n\u003cp\u003e?? Ensures smooth thread take-up and stable stitch formation\u003c\/p\u003e\n\n\n\u003cp\u003e?? High-quality spring steel for long-lasting durability\u003c\/p\u003e\n\n\n\u003cp\u003e?? Helps prevent skipped stitches and thread slack\u003c\/p\u003e\n\n\n\u003cp\u003eThe check spring is a key part of the tension system, working in coordination with the tension discs to control thread flow during each stitch cycle, ensuring reliable performance in high-speed industrial sewing.\u003cbr\u003e\nA dependable replacement part to keep your machine operating smoothly, accurately, and professionally.\u003c\/p\u003e","brand":"Seiko","offers":[{"title":"Default Title","offer_id":48314014433529,"sku":"70221","price":26.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/6733\/3113\/files\/Singer_Genuine_Parts.jpg?v=1776585822","url":"https:\/\/empenzoamericas.com\/products\/genuine-check-spring-twin-needle-70221-for-singer-144w-145w-and-seiko-jw-28bl-sewing-machines","provider":"Empenzo Americas Corp.","version":"1.0","type":"link"}