Stone splitting plug and feather.
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Previously:
https://www.homemadetools.net/forum/...081#post210803
https://www.homemadetools.net/forum/...283#post172903
https://www.homemadetools.net/forum/...414#post101520
https://www.homemadetools.net/forum/...244#post116078
https://www.homemadetools.net/forum/...982#post179733