There was a recent thread where the use of a cunningham was mentioned for controlling the position of the draft in the main sail. I currently rig my main at the mast and usually set the halyard fairly tight. The video below talks about the draft and cunningham and I decided that I want to mess with this and see just what it does. I wont visit the boat for a couple months so cant install this yet but have the plan in place. My main sail fortunately already had the cringle (hole) for the cunningham. What I have shown below should be set up for 8:1 leverage and Im thinking it will all be 5/16 line. The blocks I plan to use are all Harken 40mm (available on this web site). The first two pictures show about what Im thinking. In the first picture "A" is the cringle and you can see the corresponding spot A in the second picture (just the line running through the cringle on the sail - no block). The point "B" is on the mast and I will drill a 1/4 inch hole through the mast at this point and install the bolt "B" shown in the second picture. "C" is at the base to hold a block that will route the line back to the cockpit. Since this boat is used as a trailer sailor, I always try for fast setup. When trailered, the boom/main sail is removed from the mast so I will have to install the cunningham each time I rig. In the picture below is a loop sewn on the end of the line that goes through the cringle and once through, the loop simply fits over the fender washer on the area "B" shown on the mast. There will be a spacer between the fender washer and the mast to allow for the loop. The loop is sewn so that its real snug going over the washer so I think it will both stay in place plus be fast to assemble.