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Minnesail - Are you going to need to do some modifications to get rid the old fiberglass horn and make the hole the right size? Not sure what you mean by glassing over the studs. They should screw in from the outside of the hull. Can put some fairing over them for smoothness, but doesn't seal them. If you drill holes for the bolts that are the same size as the bolts, and use sealing material, it will be very water tight.