For what it's worth, I found out that my Morgan 36 was SUPPOSED to have a bronze
hinge at the bottom of the skeg mounted rudder. It simply wasn't there. Electrolysis made it go completely away, since it wasn't tied in to the rest of the bonding system. Next haulout, I guess I'm gonna have to fabricate something and try to figure out how to connect it to the rest of the boat.
Maybe you've got the same problem...