On my 97 powder extreme I have a Hymark secondary roller cover. It has the 600 tripple tripple zrt motor in it. On the rollers I notice a groove that is in the rollers and was wondering if this is normal or a worn roller. Tthe groove is V shaped and narrow compared to the helix landing it rolls on. The buttons are white in color and I was wondering if anyone knew if they were a brand specific replacement or if others could be used and a source for replacements.

Thnks so much!

Tony