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That's really neat, what a dad!

First thing I thought of is the coaster ride utilizing a natural hill made by the protagonist in Herman Wouk's City Boy. It wasn't circular, though, IIRC. This seems engineered quite well to give an exciting ride and then slow to a stop at the base of the hill again. I'm impressed.

Wow, thanks for sharing!
min_roadkill said:
. . . I did make my kids their own teacup style merry-go-round using exhaust pipe, unercoated plywood and industial bearings.

You just need to make a few more, then attach them all together :p
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