door handle/mirror reinforcement plates

I've certainly seen lots of doors distorted under the mirror - it gets loose, you tighten it, 2 years later it get loose and you do the same until you con't tighten any more. You take it apart and the sheet metal is drawn all the way up to the mirror base. Don't know why the door handles would do that. I've used Dynamic's kit to fix the door post around the striker and it is an outstanding product.