not bad! I tried to step-frame it in safari, but couldn't do it. however, it's as ya said. the green things hafta move with the outside of the inner ring and the control slot in the middle ring. it might be easy to solve if the connector doesn't hafta slide around the outside of the inner ring. e.g. if the inner ring rotates about its own centre, in addition to its rotation on the carrara x-axis.