Amphibious excavator pile driver.
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Previously:
https://www.homemadetools.net/forum/...345#post196415
https://www.homemadetools.net/forum/...806#post194207
https://www.homemadetools.net/forum/...567#post155235
https://www.homemadetools.net/forum/...962#post191112
https://www.homemadetools.net/forum/...950#post175737