Yes it mars it slightly, i believe the instructions say to have the bolt and hole at the 6 o clock position when changen a belt out so any shavings fall down and away, this was very minnimal.Does the bolt that screws into the helix to spread the sheave mar the helix at all or is there a metal washer that goes between the helix and the tool for the bolt to go against? Thanks
Ya thats a good idea!I keep a large flat washer with the bolt in my tool kit and put it between the helix and bolt to prevent this