icks

I am relieved my idea is sound :p I hope you find the right config and parts to make it work. Look forward to it.

Hmm, i too am apparently a poor writer of technical detail. So i present to you, similairly poor graphical skill! You were mentioning that the ball was pushing the tyre outwards? So my idea is that the outer idler balls with fixed axes would help alleviate this and maintain contact and friction bwteen the moving axis ball and the inner wheels?

I normally lurk and this is probably an obivous and of-course-it-doesn't-work-which-is-why-no-one-has-said-it solution but: Re: Friction Can you double up the wheels where the yellow half bushes are and use 2 further balls inbetween the lime green angle connectors? So basically, instead of sandwiching the ball between wheels you sandwich the wheels between balls.

Would graphite work? That is assuming it's possible to get it in.

RE: miniLA? Has this little bit been spotted here or at TBs yet? If there's any notion still that it's just a friction piston, this confirms otherwise. (cropped from lower left of this http://www.brickshelf.com/gallery/Mortymore/NEWS/2011-1H/technic_2011h1.jpg ) [edit: oh right, ta.]