Hollow concrete block machine.
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Previously:
https://www.homemadetools.net/forum/...971#post198828
https://www.homemadetools.net/forum/...172#post153757
https://www.homemadetools.net/forum/...180#post188108
https://www.homemadetools.net/forum/...579#post143186
https://www.homemadetools.net/forum/...913#post164139
