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These were a bit of a "thing" a few years ago.
My physio has recommended I use something like this to rehab a broken wrist ready for getting back on the bikeÂ
Has anyone seen them anywhere? Or cheap knock offs? Or used? Obviously I've got bars and grips kicking around. All I really need is the "egg". I'm guessing someone somewhere might 3d print such a thing. They were expensive for what they were originally.
Just make it out of wood or something. I have one somewhere and its considerably less fun than I expected, and also about as complex a piece of engineering as said block of wood..
If the app is still available, thats the only bit worth having, and from memory was a free download.
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here's mine - Giant Connect bars, Odi grips, old inner tube(s) and some duct tape. Works very well.