It seems that I'm regularly adjusting the gap between the clutch body and the engine. It's quite annoying when i'm cutting the lawn and suddenly i feel the vibration becomes strong. When this happens, the clutch body has moved closer to the engine and i have to readjust it. I usually set the gap between 5mm to 7mm between the clutch body and the engine. Will this be the correct gap ? If yes, is there something else i should check to prevent this from moving from time to time ?.