Our 34 halyards are attached to the casting on the deck surrounding the mast. Inside, the casting has two stainless tangs that attach to the mast which serves two purposes: 1) offset the upward pull of the halyards and 2) prevent the deck from springing upward as the mast shrouds are tightened and try to decrease the beam of the boat.
As for the rod holding the baby stay I seem to recall a prior similar issue on this list. The fitting was similar to a lag bolt and screwed into the fiberglass and into the keel. Remember the only thing preventing the mast from inverting (which is a disaster) or pumping (which impacts sail shape) is the baby stay. Some do not use it but I believe it to be an essential part of the mast structure taking the place of forward and aft lower shrouds. Just look up your mast without a baby stay when going to windward in any sort of seaway. My 2 cents American John and Maryann Legacy III 1982 C&C 34 Noank, CT
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