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Sometimes, when the metal has been substantially stretched, a bulge will result that will be impossible to work out. Frequently, an area like this will "oil-can" or just pop in or out. The only alternative is to shrink the area. This can be accomplished with a special shrinking hammer or, more commonly, with a torch. First mark the area that needs shrinking. To shrink it, heat an area about the size of a dime to a cherry red color (don't melt the steel), and then quickly quench the spot with a soaking wet rag. We had to repeat the process in more than fifteen spots to properly tighten up the body panel. After shrinking, the area will always require more hammer and dolly work.