Our team and myselves included are tired of tensioning the belt on the Spine and Hyperboard. Its very tricky to get a screw driver there to loosen screws and then to tighten the belt and afterwards the screws again.
So Martin worked on one version where we used some bearings that would tighten the belt. This works ok for vehicles that go one direction, but not both ways. And it was a hell lot of work with some aluminium parts etc.
So I had one idea for quite some time and this weekend its testing time. Its based on 3d prints, a spring, linear rods and brass inserts. Check out the renderings, will post pictures of it mounted on our offroad beast with 4x of them mounted.