I have re-sealed my Canon A1 recently with new foam. They come from the factory with their original seal (made of foam) but with time going by the seals go bad (crumble into sticky little pieces) and cause malfunctions of the camera/lens or light leaks. I also replaced the mirror damper foam. If there is any interest out there I can offer you my re-sealing services for your SLR (including mirror damper replacement) for $20.00 plus $7.95 for shipping (Continental USA only). Money back guaranteed if not satisfied.