I ran across the same problem on my P-19 MX... Take your dremel with a small routor bit & route around the bolt . I mean right up against it. Go all the way thru the hull. Fill the holes back with epoxy . Drill new holes & replace the the bolts with new stainless bolts & nuts. You will have to drill the holes out in the plate . Dont use the same set-up ... The corrosion problem will happen again. Stainless & aluminum weld together after awhile in the salt. If it's not clear on how to do this just let me know. Doug <img src="http://www.catsailor.com/forums/images/graemlins/cool.gif" alt="" />