I went to re-seal the aluminum chainplate tabs that extend up through the deck from the glassed-in knees. There has been very slight leakage around the chainplate tabs in the past year, but they looked very solid below and above the deck. Unfortunately, when I got under the old seals, I found some fairly significant corrosion on all of the tabs, at the deck level. I plan to consult a local rigging expert, but was wondering if anybody out there had encountered this, and if so, what route did you go to deal with the problem? I've never had a boat with aluminum chainplates, so am not sure of what should and should not be done. For example, I was think of installing aluminum plates on either side, drilling through and bolting to the existing knees, up to the tabs, but am not sure if this would compromise the integrity of the original knees. Thanks for any help/advice on this!