Definitly cover your tank.Wrap a piece of masking tape around the left side of the bar at the riser.mark the seam on the cap.Now you can slide the bars over service your throttle and put right back where it was before.
BW
Also, there is dimple in the bar that lines up with the seam where the cap and riser come together. Likewise, there is a dimple on the bar where the seam on the brake mounting mechanism should line up.