Has anyone changed out the metal holding tank on subject model? Mine is corroding to pieces. The stern lazzerttes are very small, and I don't see how any human could get down there to work on the tank, or get a replacement through the opening. I would like to replace the metal holding tank with a plastic one but I can't figure out how to get the old metal one out, or get a new plastic one in and installed. Help! The fuel tank is plastic and appears to be fine. Why didn't Hunter use plastic for the holding tank? That is academic of course. What's done is done.