{"product_id":"kansai-special-05-5490-0-leaf-spring-upper","title":"Kansai Special 05-5490-0 Leaf Spring (Upper)","description":"\u003ch2\u003eKansai Special 05-5490-0 Leaf Spring (Upper)\u003c\/h2\u003e\n\u003cp\u003eLeaf Spring (Upper), Kansai Special part number 05-5490-0. This is one of the springs that return a lever, press a part or hold a thread under tension. This part appears in the Kansai Special parts books for FX.\u003c\/p\u003e\n\u003cp\u003eThe force of a spring depends on its wire or strip, its length and its shape. A spring that is weaker or stronger than the right one changes the pressure or tension wherever it acts, and adjusting cannot fully make up for it.\u003c\/p\u003e\n\u003ch3\u003eDetails\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eKansai Special part number: \u003cstrong\u003e05-5490-0\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePart name: Leaf Spring (Upper)\u003c\/li\u003e\n\u003cli\u003eShort form of the number: 05-549\u003c\/li\u003e\n\u003cli\u003eType: Springs\u003c\/li\u003e\n\u003cli\u003eKansai Special parts books that list this part: FX\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing the right part\u003c\/h3\u003e\n\u003cp\u003eSprings differ in length, wire thickness and force even when they look alike, so match the part number rather than the look.\u003c\/p\u003e\n\u003ch3\u003eWhen to replace it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEnds that are bent open, worn through or no longer seating properly\u003c\/li\u003e\n\u003cli\u003eThe relaxed spring is shorter or flatter than a new one\u003c\/li\u003e\n\u003cli\u003eBright wear marks or grooves where the spring rubs another part\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eHold the new spring next to the old one before fitting. Note which end goes where, and make sure each hook seats fully on its post or in its slot.\u003c\/p\u003e\n\u003ch3\u003eMore Kansai Special parts for the same machines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/kansai-special-05-5480-0-lower-knife\"\u003eKansai Special 05-5480-0 Lower Knife\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/kansai-special-87-1000-0-bolt\"\u003eKansai Special 87-1000-0 Bolt\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/kansai-special-05-3930-0-plate\"\u003eKansai Special 05-3930-0 Plate\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/kansai-special-19-4160-0-needle-guard\"\u003eKansai Special 19-4160-0 Needle Guard\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eQuestions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes a spring that looks fine still need replacing?\u003c\/strong\u003e\u003cbr\u003eIt can. A spring may keep its shape and still have lost force. If a setting drifts after adjustment and the rest of the mechanism is sound, a tired spring is a likely cause.\u003c\/p\u003e\n\u003cp\u003eRelated: \u003ca href=\"\/collections\/kansai-special-springs\"\u003eSprings\u003c\/a\u003e | \u003ca href=\"\/collections\/kansai-special-spare-parts\"\u003eKansai Special spare parts\u003c\/a\u003e.\u003c\/p\u003e","brand":"PRIZZI SEWING MACHINE CO.","offers":[{"title":"Default Title","offer_id":51105711718565,"sku":"KAN-05-549","price":14.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/7593\/5397\/files\/kp_spring_v2.png?v=1793912248","url":"https:\/\/prizzisewing.com\/products\/kansai-special-05-5490-0-leaf-spring-upper","provider":"PRIZZI SEWING MACHINE CO.","version":"1.0","type":"link"}