I'm not familiar with the stick style handle... I just have a rope handle. I drilled two holes, the first about 2" in front of the stop, the second about 4" in front of that.
Thread the rop through thhe port side of the dagger board and tie a stoper, then through the starboard side and tie a stopper at the length you want.
The first thing that comes to mind would be to tie a hangman's noose with the loop end going through two holes in the daggerboard. I don't know what the actual knot is.