Annie...
Annie,I replaced the ceterboard pin on my H22, which was rotted into 3 pieces. This pin is 1/2" stainless steel and mounts to (2) brackets at each side of the bottom centerboard housing. I can't imagine that these brackets, at least one of them, is still not attached to your boat. They are fastened with 4 bolts each that run through the bottom of the bracket and come through the hull. The nuts for these bolts are accessible under the floor panels. I would first check to see if you have these brackets,even if only one or if it is damaged. You could contact Hunter Marine to see if they have them (doubtful)if you're missing one. Otherwise you could have one fabricated from the one you have. One of the Port side bolts which fasten the centerboard bracket also has the mast ground attached to it.Good Luck, I'm sure it;s a doable repair.Pete