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Re: Plug for my rudder
Rich, make it easy. Buy some PC7, a thick epoxy that comes in two little cans, or something similar. It is something like a peanut butter consistency, very easy to work with. Or, buya tube of 5200 or 4200, a good adhesive caulk.
Once the rudder is dry, plug the hole, let it set up for 24 hours before you splash the boat. Next year, just drill another hole in the same spot.
A bolt, any kinf of bolt, may or may not seal completely and will add some srag to the rudder on the one side. So...Make it simple, plug the hole flush, skip the bolt.
FWIW once you have water in the rudder, it is never dry, and it is on the road to failure. Nothing short of a rebuild or replacement will stop that, and the only question is whether that failure is going to be inconvenient, or a real problem. Next week in calm waters, or ten years from now offshore. Either way, it is coming, sorry to say.