[zendora]

Fred, I had the same problem last year. I made one out of a 3/8" piece of fiberglass board. It was a little tough to work with, but I wanted something strong enough to stand on. I ended up cutting it into 3 separate pieces with a stainless piano hinge with a piece of vinyl wrapped over the top to keep water out. It held up great last year. Good luck - any questions, just ask.