I used the washer. It is on the outside handle, just slipped over it. To cure the rest of my rattle problems, I used weather sttipping around the seal of the window to tighten it up, and also 2 layers of dynyamat on the tailgate. Now I can turn my system up all the way and there is no noise whatsoever from the tailgate. And my system slams, too. Check my sig for pics of it.