Diesel piledriving hammer.
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Previously:
https://www.homemadetools.net/forum/...598#post162794
https://www.homemadetools.net/forum/...4104#post79337
https://www.homemadetools.net/forum/...178#post115841
https://www.homemadetools.net/forum/...856#post140403
https://www.homemadetools.net/forum/...542#post143033
https://www.homemadetools.net/forum/...567#post155235
