Time to reseal some side opening ports. I'll be using the highly recommended butyl tape. But I've got a more basic problem first - How do these ports come out? My boat is a 94 Cat 36 with Lewmar ports that open towards the inside cabin. Probably standard. They have an aluminum frame on the exterior that is sealed flush with the cabin. There is a plastic molding type cover around the ports on the inside of the cabin but I don't see how these come off. I was pulling and squeezing on one and it wasn't moving. I thought maybe they just snapped on and off but maybe not. Any sugestions are appreciated. Walt