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bushings are made from copper and need to be fairly hard to withstand the heat of friction ,, I E Crank and cam shaft bearings on some cars, and military vehicles as well use it in many places so yea it can be hardened .
Sam
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R. Yates 13 & On Forge
Live and Let Live , Do Not trespass on Life or Me! As we are not so kind or forgiving !
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