Double drum cutter head breaking concrete.
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Previously:
https://www.homemadetools.net/forum/...918#post217306
https://www.homemadetools.net/forum/...197#post214673
https://www.homemadetools.net/forum/...420#post166193
https://www.homemadetools.net/forum/...066#post164777
https://www.homemadetools.net/forum/...457#post208755
