nccb, hate to here about your tank, I'm in Greensboro and I worked yesterday. But at times it sounded like the roof might be coming off, so no wonder your 750 got knocked over. These old tanks are pretty thick metal on top so I don't know if you will have any luck getting it to pop back out. Maybe if its on the side being thiner you might can do something. My K6 had a dent on the top edge of the tank when I got it in 2009 and other than that the tank is in excellent shape. I've tried all the tricks heat, cold, dent pullers, etc, no luck. The rest of the tank is so good I've just learned to live with the small dent. I've thought about having a Dent Pro give it a shot but never have.