Sunfish Daggerboard Floats Away

The new daggerboard for my real old sunfish keeps coming out when I capsize, I still do, a lot. Most of my thumb was sewn back on when I caught it in the rudder last year, as I flipped. Without the help of strangers the daggerboard, and me, would have been lost. Any ideas on how to keep this thing in until I need to raise it and particularly when I flip it. Thanks. I thought of a cleat on the deck but the boat is so old I worry about how to attach it. Ideas on that would be helpful too...

Sunfish Daggerboard Floats Away