i had a slight separation between the aft end of the keel and the hull. I used a flexible epoxy to repair. Once the travel lift moved our sailboat up, the crack reappeared. I am thinking that tightening the keel nuts should solve this problem. But, our boat is 1500 nautical miles away and I do not own any 3/4" drive sockets. Does anyone know the nut size on these or the 37.5 keel nuts?