Make it yourself
March 30, 2011
$30, for something you can make for yourself fairly easily?? I don't think so.
It's a GREAT idea (I wish I had thought of it earlier), but it's really so easy to make. Assume that #2 on the 'trainer' is half the radius (1.125") from the center of the ball (which measures a total 2.25" diameter) and the rest is simple.
All I can say is 'sorry, but thanks for a wonderful idea'. Good luck with it.