Pile driving hammer.
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Previously:
https://www.homemadetools.net/forum/...950#post175737
https://www.homemadetools.net/forum/...567#post155235
https://www.homemadetools.net/forum/...598#post162794
https://www.homemadetools.net/forum/...994#post217532
https://www.homemadetools.net/forum/...202#post203843
