[Greg Peshek]

As far as the groove/ separation thing, something we figured was an easy solution and are implementing right now.. is just putting the urethane belting directly onto the ungrooved PVC and using some old pneumatic tubing as guides to keep them in place.

The pneumatic tubing is just wrapped around the piece of PVC, wood screwed in at the ends and then we used CA (cyanoacrylate) glue to keep the middle of the pneumatic tubing from sliding anywhere.

It's a fairly easy and cheap solution. If you have a lot of left over urethane belting, you could always use those as guides too. Just go through the same process I described but with the belting. Of course the belting is probably more valuable than old pneumatic tubing.

-Greg