In this case, there is no good commercial option. As common as these are, I have no idea why.My F-24 trimaran has 8 of these hatches on the outriggers (amas), and when sailed in spirited conditions, they go underwater a lot. The hulls pant a little with the water pressure, and unless snugged down, they leak a lot. It can be gallons per hour. Snugged down properly, they get stuck. Keep em' clean, keep em' lubed, they can still stick. Beckson makes a crappy wrench. People tap them with blocks of wood, use oversized Crescent wrenches, and even metal pin...