Hollow core slab wheeled placement rig.
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Previously:
https://www.homemadetools.net/forum/...349#post110233
https://www.homemadetools.net/forum/...080#post125690
https://www.homemadetools.net/forum/...699#post136706
https://www.homemadetools.net/forum/...558#post123053
https://www.homemadetools.net/forum/...463#post131853
