Re: wet rudder and winter time comming soon
Basically, take a half inch drill bit and drill through the fiberglass skin and into the core. at the bottom of the rudder.
It's just foam or some other core wrapped around a metal rod with maybe some tabs on it under the fiberglass (assuming a small to mid sided boat).
When it's dry/Spring before paint and launch use epoxy and fill the hole.
Lessons learned are opportunities earned.