swim platform backing plate mount

Hello to all, I am new to the site and so far it looks to be a wealth of knowledge. Quick question, my 03 220 sundeck is in need of a swim platform ladder replacement. I bought one that should work but after removing the old one it appears as though metal is below the fiberglass. Does anyone...

New to me 450DA w/ Factory standard swim platform. Aluminum backing plates are used both inside and outside the hull to spread the load out on the swim platform supporting bolts. Surveyor pointed out significant galvanic corrosion between the stainless bolts/washers and the aluminum backing...

New to me 450DA w/ Factory standard swim platform. Aluminum backing plates are used both inside and outside the hull to spread the load out on the swim platform supporting bolts. Surveyor pointed out significant galvanic corrosion between the stainless bolts/washers and the aluminum backing...