The hard part will be carrying the forces of the staysail stay OUT TO THE HULL. Just putting a backing plate in may not be a good idea. You may just succeed in lifting the deck off the hull.
I've seen it done by rigging a permanent post from the underside of the deck down to the hull, and STRONGLY glassing in at both ends, with a tie through the deck. I can imagine you could do it with a fitting on the deck, then a removable chain to a fitting on the hull. If it were me, I'd find a naval architect (i.e., someone who knows what they're talking about) to help you figure out how to distribute those forces.
And you may need to look at running backstays.
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Last edited by lshick; 11-21-2009 at 02:28 PM.