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Don't need superhard to work rock, it just makes longer mtbf of the focus. Needs to be able to transfer the blow force to the rock such that you start a crack by fracture. Soft tools need repointing often. Crossgrain shaping is tougher but you could use just a hammer for that. Easter islanders used loose rocks and tree parts for their Maoi.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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