Once when flying my Spitfire I was doing some loops and rolls and saw a little shiney thing fall away from the plane. It was my stick on lead weight!! Immediately the plane was all over the place and I could barely control it. I was bringing it in to land and about 15 ft from the ground it snapped and dove straight into the ground. Busted it up pretty good. Now I back up my sticky weights with a little packing tape for insurance.