Rudder Post
Assuming this is a wheel steering boat, first turn the wheel and make sure that the stuffing box is not turning along with the shaft. If that is good, tighten the 3 bolts. If it does not stop leaking, remove the 3 bolts and the top plate. Replace the flax with one ring of 3/8inch packing. It will be above water line, but just barely. Don't have 3 heavy friends back there helping. If you change the flax, only snug the 3 bolts. Too tight can cause the stuffing box to break loose from the fiberglass tube-big problem. If you have an 85 or newer boat, you can remove the bulkhead in the port locker, get inside, and stick your head and shoulders into the lazerette to gain access to the stuffing box.