Rock crusher.
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Previously:
https://www.homemadetools.net/forum/...072#post168528
https://www.homemadetools.net/forum/...046#post153345
https://www.homemadetools.net/forum/...515#post155011
https://www.homemadetools.net/forum/...3602#post99570
https://www.homemadetools.net/forum/...718#post147960