I have a 1973 Sunfish, all original. At some point the bottom cap of the mast went missing. When I went sailing yesterday and flipped, the boat went all the way over (turtled). After sailing, when I removed the mast some cork fell out. Did it go all the way over because cork is missing from the mast? Aside from replacing the bottom cap, what do I need to do to restore the mast and its bouyancy? Thanks in advance.