Im trying to determine the cause of erosion of the centerboard pivot pin from Arcturus, our 36-foot Soverel keel/centerboard cutter. It is a -inch diameter silicon bronze pin installed new in 2004. I removed the centerboard a few weeks ago and was surprised to see that the pin was heavily corroded. Ive attached a few pictures of the pin. The boat has a fiberglass encapsulated lead keel, with the lead bedded in a resin/sand mixture. The pivot pin fits in a hole drilled through the keel and centerboard trunk (which has encapsulated lead on both sides).