The rudder stuffing box is just above the water line - until the stern is loaded and, or the boat is underway, then it is below the waterline and the stuffing box is needed to keep water out. Mine has leaked for years. You will find it first, very difficult to get back there and actually get to it. second, when you are there there is no room to work. third, the gap space to get packing into and out of is about an inch at best. For all of these reasons I leave mine alone and go on to the next to-do item on the list.