I once played with a design that would use a helve arm that would extend past the pivot point and with an over balanced weight instead of a spring. My reasoning was that the mass of the counter weight would be applied to the hammer side as the hammer hit the work. One draw back would be the force applied to the pivot bearing at the strike. I never found my "roundtuit" for this project. maybe some day.
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Iron... the other thermal plastic
"He was the kind of a guy that could screw up an anvil with a tack hammer"
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