Rotary Cutter How to best fix ridge around top of brush cutter?

[JimME]

I checked the U-Joints on each end and they were "in phase". I don't know what the problem could be. I'm going to call the dealer tomorrow and see what they suggest. I bought it out of state, so this should be an interesting test of long-distance service. I'm thinking the PTO shaft might be bent slightly causing the problem.

Thanks again for the suggestion.