ON MY 1993 CATALINA/MORGAN 38 CENTERCOCKPIT DEVELOPED A LEAK AT THE RUDDER-SHAFT INSIDE THE BOAT.THERE IS BAD ACCES UNDER THE STEARING-QUADRANT FOR TOOLS ON THOSE BIG HEXNUTS.IS THERE ANY WAY TO REPLACE THE PACKING WHILE IN THE WATER?OR DO I HAVE TO HAUL THE BOAT OUT AND DROP THE RUDDER?