This technique really does work well!
Here's what we learned:
1. Soccer balls come in different sizes for different age kids. So far, we've only used the regular sized ball- you just deflate it more to get into smaller spaces, but I have my young daughters smaller ball, too. I like the soccer balls because they're carcass is not so stiff like a basketball. As such, it conforms and presses outward uniformly, and over a larger area. No more hammer dents going outward.
2. We use a $12 bicycle pump- the scissor kind you work with your foot. We can control the pressure that way and use it anywhere.
3. In the rear quarters, a soccer ball isn't big enough so we put boards in first to stand it off from the longitudinal.
4. The doors are skinned anyway so we just use our feet and a board to push out dents there.
5. If you get a dent in one of the factory body creases, you're going to have to follow up the dent removal with another tool shaped like a chisel in order to restore the crease.
Using this technique, we got the 924S back to 90-95% with no body panel replacement- though we did have to patch up the blue vinyl a bit.
Thanks to Jim Richmond! The money I saved repairing my car can now be spent on entry fees!
944 Spec racer since Feb. 2003http://www.comeauracing.com