Paint stripe is a good trick. We'll fix the intermittent slipping issue on the clutch of the rotary cutter after we finish installing the suspension and tis wheels on the truck tomorrow.I have one on one of my rotary cutters. I believe it is a separate unit from PTO shaft. I adjust mine having it "slip" when I get into really heavy stuff. I put a white paint stripe across the clutch to verify it changes position then watch for slipping with a point and shoot thermometer. I want to see some slip under really heavy load and cool running in normal stuff.