I recently acquired a Pellet master pm 2000 stove and was cleaning it out to get ready for this coming winter. When I removed the top plate to clean ash off of the heat exchanger tubes there was 3 flat metal pieces about a 1/4 inch thick with a 90⁰ bend on each side. It seems as though they sit on top of the tubes and possibly hold the side baffles down but I'm not sure. They were just in a pile above the tubes it seems like they were tossed around when I was moving it. Just wondering how they are supposed to sit above them, thank you in advance.