Excavator-mounted helical pile drill.
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Previously:
https://www.homemadetools.net/forum/...071#post141081
https://www.homemadetools.net/forum/...173#post138380
https://www.homemadetools.net/forum/...786#post136934
https://www.homemadetools.net/forum/...804#post129173
https://www.homemadetools.net/forum/...534#post110853
https://www.homemadetools.net/forum/...482#post110702
