get the cleat with aluminum teeth. You will wear through the plastic really quickly. This happened when I had a cleat like that on my 6.0. You essentially grind away the plastic pull up the spin.
Run a soft outer casing on your halyard for single cleat, or double cleat if it is a hard outer casing. If you are one up, I would not mount the cleat on the mast. Mount the cleat on the front beam and run the halyard through a pully on the tramp, hoisting from behind the pully.
