Originally Posted by Roadrunner
I used an air chisel. First I used a center punch style tool to punch the center pin in then a flat chisel type tool to cut the head off. Keep the chisel sharp and it cuts the heads off easily. Same with the bucked rivets, keep the chisel as sharp as possible and it will cut through them. Too bad there are about a cajillion of them.
I also used an air chisel. First I used the narrow punch to push the center pin back a few millimeters. Then I tried a few different chisels. I found that the one with a V in the center and a 30 degree bend in it worked best. Because the center material has been pushed inwands, the first few chisel strikes allow one end of the rivet to be smashed into the newly created void. This also creates a little lip and the bent chisel head can get behind it. It it didn't cut through right away, I was able to do a little prying motion while the chisel was running, kinda like a crowbar, and that popped the rivets right out. Luckily, my bus has a lot of screws, only every fifth one was a rivet. Still, a short step stool will help a ton to keep your arms from getting too sore.
The first pass, with the center punch, each rivet took about 4-5 seconds. One the second pass, with the bent chisel, each rivet took 3-8 seconds to remove.