Many small mechanisms contain a spring or two. Ballpoint pens, for example, use coil springs while battery holders rely on beam springs for contacts. When the need for a spring arise, users can pick a ...
Machined springs from Helical Products Co. Inc., Santa Maria, Calif. (www.heli-cal.com), have features cut from a solid blank of material. Gears, cams, tangs, flanges, and threads all can be ...
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