@fo0k Thanks for your quick response. Sounds promising but I've never got a horizontal wheel to work as intended (roll and have tension in the horizontal plane). Will try again now when new hope has arrived. Appreciated.
Has anyone actually tried these ideas? I want to achieve this but has so far not succeeded in making a coupling which acts like its supposed to. And I guess adding alot of friction to surfaces or the sticky code does not work? The problem with springs are that they react in all directions if enough ...