Hi I see a few people on here wanting to fit cat flaps. I want to remove one. It is in the panel of a door, looks like plastic. The previous owner ( I just moved into house) has kept the original door panel, so he reckons the panel with the cat flap in it can be removed and the original panel without a cat flap put back in. It's not obvious how to do this - there is some sort of rubbery-looking seal strip say 1/4 inch, then a bevel strip say 1/2 inch, surrounding the panel. Anyone know how these doors fit together please? I don't want to break anything. TIA, Terry