I'm wondering if anyone has come up with better rollers for the sliding canopy. The rollers on my 6 are already worn and I haven't flown yet. The nylon actually wore down and the brass washer was touching the slider track. I had to take down the brass washer to a smaller size. I would love to get a set of ball bearing rollers to replace what's there. I did try some shower door roolers that were the right ouside diameter but they were much too thin. Anyone have any good ideas?