The edge of the upright piece. I have to bop the tube into place. They are not bent exactly. I'll get a pic in a few and you'll see.

I want to replace that one piece with a slightly taller piece that has a raduis milled onto it. That would cut down or eliminate the scuffing. For now, I've got a bit of a radius on the edge now, but, it really could use a more gentle, consistent radius to ease the tubes into place.

But other than that, I'm really liking the setup. I've got a pretty good work flow going