As far as the oil canning goes. I pushed it in kind of hard. it went in, and I had to push it back out from the backside. I put just some heat over the center. Without raising it any higher than what it is. Then quenched it. It stayed where it is, but the oil can effect is gone.

I got email today from Harbor Freight that they have a stud welder on sale for $90.00. I tried already the doughnut dolly on that crease, and hit on the crease from behind. The crease just won't move. If I bought another one of these.. I would then lay the studs down the crease how far apart?? I don't want to use that slide hammer, because it seems to pull to much up. I did see something on ebay. It looks like a rivet gun with a cage on the front.It pulls the dent up in a more controled way. That is if it works. After the studs are down the center of the crease.. And I start at the least dented first.. Should I then heat down the center of the crease and try to pull it up??