Concrete wall saw.
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Previously:
https://www.homemadetools.net/forum/...631#post186083
https://www.homemadetools.net/forum/...195#post172590
https://www.homemadetools.net/forum/...502#post170045
https://www.homemadetools.net/forum/...380#post161852
https://www.homemadetools.net/forum/...764#post159749
https://www.homemadetools.net/forum/...677#post159400