Thanks for the pic. I am not sure how to describe it but the current mount for the stays has a slot in the plate that the flat bar goes thru but does not attach in anyway to so it must be sealed. But I am sure it flexes allot under load opening a gap.Ill try to get agood ic of it and post it later this week.
As far as the keel coring I probaly should have callled it bedding. It is some type of very hard close grain wood bedded into the fiberglass that the keel bolts go thru.