Burned up oven door gasket needed replaced.

I started by removing the door, then trying to remove all of the screws in the oven casing. Of course the very middle screw in the bottom of the oven was rusted and dammged by use. I had to use a drill bit and remove the old screw. After dissasembly of the oven casing, I found that the lip that supports the gasket was rusted and burnt away about 3/4 in. I placed the new gasket in and found that when closed it covered this defect and sealed. I reassembled and cheked for operation.Ok! Imortant--remove the elements before removing oven casing.