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paul2748 is on it. Some hobby and hardware stores also often sell cork in sheets. Be sure its a fine-grained cork so it bends, compresses and holds-together better than the course-grained stuff. I've tried other gasket materials but while often more water resistant, found they typically don't compress like cork does. I use the old gasket or lens as a pattern and cut the cork with an exacto knife for a sharp edge.