I have had a terrible time trying to get my timing belts done. The back plastic covers could not be removed because the brass inserts were free spinning. I finally had to break/melt one out and epoxy it back in. I hit the plastic with my Dremel tool to clean it up before I ran the epoxy and I accidentally nicked my timing belt roller. It isn't bad, but I want to know if it is safe to still use, or should I replace the whole gear?