Quote:
Originally Posted by bavaria911
It was only a matter of time that someone or a company would copy Karsten’s spring design and profit of his R&D of 2 years before selling his well designed and tempered steel spring that never weakens.
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From a US Patent:
Bushing 32 also rotatably carries operating handle 62 which is movable axially of pin 64 so as to be moved closer to, or further away from, the knee of the driver. Handle 62 is held in adjusted position relative to pin 64 by set screw 65 and, at its junction with pin 64, the handle is biased toward lever 24, or to the right as viewed in FIGS. 2, 10 and 11, by spring 66 which is coiled about bushing 32.