I use a setup similar to the one in the picture for my Prindle 19, and it works great. I recommend it highly; you only have the one (or two) holes in the mast itself. The bail (or leash, or tether) that holds the halyard to the mast is drilled thru the luff track and does not compromise the watertighness of the mast. Further, it minimizes weight aloft, and promotes mast rotation. All good!

sail fast