 fitted them on the Sun Cat, and they show up quite well on the attached photo. I ran the upper part of the lines over  cheek blocks on the mast, then to a single control line back to the cockpit. This allowed adjustment of the tension of the  lazy jacks from the cockpit, and also allowed the lazy jacks to serve as topping lifts. The way I had them positioned along  the boom wasn't perfect as far as collecting all of the sail when it was lowered, but did well enough to keep it from falling  all over the cockpit.  I  AnotherSun Cat Lazy Jacks Installation  31