i assume the dolphin striker floats up and down through the beam.
does the beam have anything welded into it to keep water from entering the boat?
are the stainless plates top and bottom of the beam to locate the dolphin striker and stop wear on the beam?
i see some "rope" from the bottom of the dolphin striker to the intermediate beam, were you having problems with the striker moving around?
Yes, the dolphin striker, which goes through the beam and is welded to the mast step, is free to move up and down.
The beam itself inserts into a socket laminated into the hull. I've attached a photo showing how far the socket goes into the boat. It is integral to the bulkhead.
Yeah, I think the stainless plate performs a bunch of functions; wear, centering, and strengthening.
The rope is actually a stainless wire with a turnbuckle. According to the importer, Pilkington built the boat with this to stop the beam from rotating when "under extreme load." That's never happened and we're really had the boat in some hairy stuff. I've since replaced it with dyneema. It would take some load I suppose, since the mast crossbeam is elliptical in profile, so if it rotated you could imagine what would be happening to the hull!