I removed my chainplates this winter and was relieved to find no core material. All solid. Yes the flange prevents making an easy fix, you do have to remove the chainplate to get at the material to be removed. On mine, the leaks were more of an issue with the bolts, not the plate. Still haven't replaced the chainplates, I am having stainless ones made. Also haven't concluded which material to use for sealing. I may do butyl on one side and polysulfide on the other to see which holds up best. I will say butyl would not cause as much of an issues when removing them the next time as the caulking did this time.
-- Brian Fry S/V La Neige 1993 C&C 37/40XL HdG Maryland
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