Chris,
I re-bedded the tabertackle on our Capri-18. Both the 18 and the 22 share many parts, and construction methods. Once the tabernackle was removed, I cleaned out ther holes real good, and undercut inside with my dremel tool. I then taped up the two holes from the bottom and poured in WEST slow cure epoxy that was slightly thickened with their high strength powder mixed in. I was surprized to find there were voides between the cabin top and the linner. I let is flow in and kept filling until the void was evidently gone. I would use a tooth pick to help work out air bubbles that come to the surface. Once the voids were filled, and the epoxy cured, I re-drilled the holes and sealed it with 3M 4200. This way if she ever leaks again, any water will go straight thru and not into the core. I almost forgot, this is a good time to remove the deck wiring and pull the wiring back into the cabin, and seal this area the same way and re-drill to route the wires back up to the cabin top. This will give you a solid base that won't compress again. Our Capri-18 had the two stainless steel compression posts, as I believe the Capri-22 also has, so I assume the construction is the same, or similar.
Don