Have not. The only thing I've seen is a bronse cover that is held to the hull with screws. It would work, but it ain't pretty.
Why have clam covers at all? My 25 has straight out holes through the side, seems to work fine. Even when the boat is rolling, not much water comes back in. One thing that might be important. Mine has a small well to catch water coming off the deck or in thru the hull
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