Peening is very simple. First, you will have to get one of those coarse grinder deals for your drill if you don't have a Dremel tool. Once you grind the old pin down a bit, you can knock it through the hole. Insert new pin and brace the back against something solid. Take any type hammer and whack away at it. The end of the pin will deform and not allow the pin to exit the hole. It doesn't have to be pretty to make it work. I've done this on one of my windows. I have another one waiting in the wings to be fixed. Honestly, the worst part is getting the door panel off and back on.