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dan_the_welder
on Aug 5, 2009
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Inventor's Bike Folds Into Its Own Wheel
It looks like he is using a modified S&S coupler. The S&S for strength with either a bungee (like tent poles) or a hinge inside.
http://www.sandsmachine.com/
edit:I see someone else has posted the S&S link already
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http://www.sandsmachine.com/
edit:I see someone else has posted the S&S link already