Laser Centreboard Shockcord

Centreboard shock cord kit. Includes 7mm shockcord, hook and length of cord

Tie the cord in a loop through the hole in the top of your daggerboard, tie one ond of the shockcord to the bow fairlead and the other to the hook.
The hook then clips to the cord loop on the daggerboard.

Or you can reverse the above whith the shockcord tied to the daggerboard and the cord tied to the fairlead so the hook is out of the cockpit area.