all that worry for (almost) nothing! The welder/rigger/friend, pulled all the chainplates last week, two at a time, and the supposed crack I saw was just the end of a weld. The PO must have replaced them at one time as they were in excellent condition. They were rebedded with polysulfide 3M #101. The old silicone seemed to be just laying next to the plates and stuck only to the sides of the opening. It has been raining this week and no leaks now. The drying time on #101 is 2-3 weeks befor testing at sea.
Susan
Susan