My hulls are from an older H16, with the serial number stamped on the front pylon. The serns are kind of puffy, with indents where the gudgeons attach. One of the sterns recently split. I think this is from the corrosion of the plates in the sterns. There was some "white riust" around them when I refubished the hulls 2 years ago. Anybody have this problem and a way to fix it?