Electrolysis / Keel stepped mast
Thanks Bill, Navtron and all that sent suggestions.
I appreciate the great info.
I think part of the ongoing problem is that I can''t keep the saddle and mast base dry. The saddle is at the very bottom of the bilge. An 1/8 inch of water wets the base of the mast. I''ll clean, paint, keep the bilge as dry as possible and keep an eye on things.