Thank you Nick,
Not fooled, you do me an injustice. I would never have bought one.
This is definitely not a perpetual motion machine, to class it as such is misleading.
My continued participation in this thread was due to some people trying to explain that there were reaction forces that turn out not to be there. I wanted to try and understand what they were saying, and failed because it isn't true.
My intuition was that the dynamics should lead to elliptical motion. Any help in proving this would have been welcome. It was impulse analysis that gave me the answer I wanted. Had you have posted your latest post first
Jiff, I was attempting to draw up graphically, what Nick has just explained. Work out the impulse around the cycle.