I got a spot weld cutter drill bit at the local paint and body shop for like $15, and it worked pretty good, but with the state of things, an air powered body hammer actually worked a lot better with a chisel. My rocker on my 72 driver's side was a real mess.

\'59 Chevy 1-ton
'72 c-10 (in progress)
The Great Rust(less) Mountain
\'47 Jeep cj2a