Ok Cool.

I recreated Shilicas tracks, this is just my version. Idea was his, look at his work too and compare our versions. :) To figure out how to build them, a needed to reverse engineer his creations. Try to make tracks too and send me here your work ;)

I never thought to use a piston to provide tension.

You can compare my and your design. :) my version of tracks is simplier. (And more ugly :D )

No, i recreated it.

So you just copied my work and published it as your own?

thanks!