Walking spider excavator.
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Previously:
https://www.homemadetools.net/forum/...573#post170310
https://www.homemadetools.net/forum/...260#post141990
https://www.homemadetools.net/forum/...500#post122771
https://www.homemadetools.net/forum/...6492#post83778
https://www.homemadetools.net/forum/...342#post122017
