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Jim,
I would cut a slightly oversize (so you won't see it) outline mask out of 1/8" tempered masonite, and hot glue some 1" wide x 3/8" thick, slate coloured door sealing felt to it in the I.D. to the shape of the mask. If you can find a square foot of 1/2" thick navy or slate colored felt and cut out the holr for the picture, so much the better.
Rob
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