We've got hull 3. There's about two inches of
clearence forward of the mast, about 1/2 inch aft. (the mast goes through a fairly big rectangular built up area in the deck.) Ours came with a decent pair of blocks, one a U shaped wedge which fills the space in front of the mast and a much smaller block which rides just behind the mast. As near as we can tell, this puts the mast where
we want it through the deck.
- David (J/30 003, 22604 "Youthful Indiscretion")