String monorail car thing
Description
A while back I made a string monorail car type thing with an Erector set and a piece of wood. I happen to have found it in one of my old storage boxes. It didn't run reliably on a sloped line and was too heavy causing the line to snap if i tightened it enough to keep it from bending downward (darn gravity). So I decided to pop open the Sketchup and design a replacement.
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