Backyard roller coaster.
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Previously:
https://www.homemadetools.net/forum/...048#post214130
https://www.homemadetools.net/forum/...770#post140131
https://www.homemadetools.net/forum/...657#post155615
https://www.homemadetools.net/forum/...710#post136761
https://www.homemadetools.net/forum/...095#post125771