Springs on the spool for tension and a spring so it can be backed off

Torsion Springs: Types, Uses, Features and Benefits

PREMIUM QUALITY - The spring assorted set is made of high quality zinc plated steel, which provides extra durability while giving the right amount of

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Torsion Springs: Types, Uses, Features and Benefits

Passive Mechanism for Maintaining Tension at a Spool to Within a Given Window - Tech Briefs

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Torsion Springs: Types, Uses, Features and Benefits

Size: Compression spring sizes: 7.14 * 12.7, 5.55 * 38.1, 7.14 * 19.05, 6.35 * 10.31, 5.55 * 17.46 (10 pieces per size). 9.52 * 19.05 (12 pieces).

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200Pcs in All: Including compression spring and extension springs, this assortment will meet your varied working needs. Sturdy Design: Comes with good

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