Pipe dollies.
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Previously:
https://www.homemadetools.net/forum/...038#post207284
https://www.homemadetools.net/forum/...029#post203021
https://www.homemadetools.net/forum/...718#post182831
https://www.homemadetools.net/forum/...493#post193022
https://www.homemadetools.net/forum/...096#post153550
