Hi - we're trying to remove the door to our pellet stove (Osburn model hybrid-35) so we can take it to the store to have the gasket replaced. I'm not able to locate a hexagonal screw tip locally & the socket wrench with an Allen tip that I used doesn't work. Anyone able to help? Aren't these screws supposed to be able to come out? I'm assuming so as the stove store people told me to bring the door in. Thank you.