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Who repaired the deck? The piece should be weight bearing. The deck when re-installed should be sealed in place. If the repair is not strong enough to bear weight you will probably crack it in half if you have to remove it again. I have seen very detailed postings with pictures showing the correct deck repair in this website. A bit of work but the top surface remained intact. From what I gather finding a replacement deck is a stroke of luck.

I would recommend to have the deck repaired structurally to original factory specs. If not. Rip some pieces of starboard or teak and make up the space on the edge, seal it and screw it down, and pray some one does not crack the surface by walking on it.
gchuba