odf,

OK, I think we can forget about the ERC fix for the hip. Whilst I had not visualised it correctly, the basic idea was sound, when the handle is translated via the dial. Unfortunately I had forgotten about a bug that happens when slaving translations. As soon as you try to move the slaved actor via the mouse, it goes crazy.

I also tried using 'linkParms'. Again it seemed to work fine with the dials, but the other actor did not respond when either part was  moved via the mouse.