Concrete boring machine.
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Previously:
https://www.homemadetools.net/forum/...519#post166600
https://www.homemadetools.net/forum/...459#post139099
https://www.homemadetools.net/forum/...165#post161143
https://www.homemadetools.net/forum/...905#post152724
https://www.homemadetools.net/forum/...986#post129701
