[jims69camaro]

i used a "nail gun" type of tool that would "tack" weld a stud to the metal

this is known as a stud welder

and then u would use this other tool and yank it and it would get most of it out,

this one is a slide hammer

i then used a hammer and a block of wood and hit the inside and then use the wood as the stopper.

if no other tools are available, then this would work. hold the piece of wood on the other side of the metal where you are going to hit it with the hammer. if we are talking a claw hammer (carpenter's hammer), then hit as lightly as you can and still have a subtle effect every time you hit it. slowly, but surely, the metal will go back to it's original shape.

got it as flat as possible then used a lil bondo to smooth it out

this is the correct use for bondo. at least you tried to flatten out the metal first instead of just using bondo to get the surface flat - which is where bondo gets such a bad name. anything over 3 mils is really too thick and you should try working the metal some more.