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Thank you for the advice.Aluminum can be built up using the heliarc process, and sanded to finish. Professionally, it'll cost at least $100, unless your local High School shop class can provide the service. (Probably free).
Ok will do that, clean it up The mounting bolts are still solid .Not a Sunfish rudder (cheek) either.
I would just try to remove most of the corrosion and see if the rudder functions properly.