Sorry, missed your question, Tom. There are portions of the cover that will allow for the extensions to move outward. The original cover was falling apart - you can see the bits of cotton on the floor under the board, but I had another Teflon cover from a little later on that had the wide top to allow for the extensions. When I put it on, it seemed too big and ill fitting so I just used the blue one I found at the sale. I think age had taken it's toll on the elastic edges which made it loose and sloppy. I could probably make a properly sized cover fairly easily - and would rather have cotton anyway.