Square hole digging tractor attachment.
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Previously:
https://www.homemadetools.net/forum/...585#post143210
https://www.homemadetools.net/forum/...263#post141998
https://www.homemadetools.net/forum/...440#post116871
https://www.homemadetools.net/forum/...058#post112315
https://www.homemadetools.net/forum/...993#post100437
https://www.homemadetools.net/forum/...402#post101478
https://www.homemadetools.net/forum/...4470#post80004