Hey all. i started working an the rust on the roof of the Swinger. One issue is it looks as if some one sat on the roof at one time and put a dent in it. I can push it out from the inside but as soon as I let go it just pops back down. I was thinking I can heat the metal and then cool it fast. Will that work to shrink the metal? or dis there some other way to get it out? Any one have any idea? I will post a pic of what i an talking about but not sure if the dent can be seen in a pic.