I just had a couple of dents worked out of my '75, CB750F tank by a paintless guy, looks perfect. He told me up front he would give it a try, he is usually 50/50 on motorcycle tanks and could not give me a guarantee. In my case he said if he was not successful he would not charge me. It cost me $75 and I'm real happy with the result. Basically I'm thinking I could have done it myself, its a matter of having the right tools. He has a variety of steel probes with various bends to get to the place he needs to be. He had a cotton cloth rubber banded over the tip, I imagining the tip is like a steel ball and he puts the cloth over it to buffer the pressure he applies.
He has a very bright light that he shines across the dent and then just starts working the dent out, you can see the metal bending under the light. Releases the pressure to see how far the metal moved and so on and so on.
The very 1st issue is if he can get one of his tools to the backside of the dent and apply pressure. In my case they were both easily accessible!
What I would recommend, and what I did, was just started asking around at the auto repair shop I used, etc. My auto shop guy referred me to a guy that paints motorcycle tanks. When I went and showed him what I had he referred me to the paintless guy. I'm thinking there are some guys who have experience with the kinda thick steel we have on our tanks and most of them are not. Most auto skins now seem to be paper thin, you can push a dent into them easily.
