It is a rubber edging that is glued on.
I can give you that link if you need it.
Don't bother to make your own screens. Go to Walmart and buy the kitchen sink screen strainers for $.97 each and just trim them back to fit the stacks. Glue them to the rubber edging.
http://www.walmart.com/ip/Main...nk-Strainer/44728116
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