Re: Embedded Chain plate maint/replacement
I ground out my chainplates and re-glassed them in, after shortening them a little. I cut off the high stress area where it goes through the deck.
The crazing on your hull looks like water got in the chainplate pocket and froze, many years in a row. I have heard some folks drill a small hole in the pocket on the inside to allow water to drain out. The builder just glassed over the chainplate so there is plenty of room for water where the glass makes a radius over the edges of the steel chainplates. No way to know how it is in there unless you cut it out and inspect. It's perfect conditions for crevice corrosion.