I am working on a 2007 Chevy 2500 for my friend, There is 3 good size dents in the passenger fender and I can not get behind them to knock them out and I don't want a bunch of filler in them either. I was thinking of drilling holes in the dents and using a slide hammer to get some of the dent out and then weld the holes up when I am done? Any comments and help is much appreciated.