My boat came with a Parker standard setup with the tackle coming down through the centerboard cap, aft, and out to the sides just in front of the traveler. This system seems to work all right when the boat is on shore. While sailing however the cleats are in the wrong place right under the skipper, and the lines bind on the blocks on the centerboard cap whenever the boom is let out.
The new system is pretty close to a Waterat standard. Using the same cascade between the boom and the base of the mast, attach two Harken bullet blocks near where the vang attaches to the bottom of the mast, replacing the blocks in the centerboard cap.
Next attach two micros to the corners where the bulkhead and tank meet on either side. The vertical position of the micros will depend on where you will lead the line aft. I lead it aft just over the top of the thwart, so the micros were positioned about 1/2 inch higher than the top of the thwart.
Likewise you should attach two micro cheek blocks (Harken 233) about 1/2 inch higher than the thwart as shown in the photo to turn the line up to the cleat. Affix small cam cleats on the tank above the cheek blocks. Look at a Waterat and measure to locate the best place for the cleats. Make sure they are far enough forward not to be under your forward leg while sailing upwind in normal position.
Ensure when installing all the blocks that the line runs straight through, and doesn't chafe or bind the blocks. This will make a huge difference in the sailability of the boat.
Replacing the vang cost about $60 in hardware and fasteners (make sure you get large stainless bolts and generous backing plates for everything, remember, the vang carries pretty heavy loads). On 4565 I used the largest bolts which would fit through the forged eyestraps, and backed them with 1" fender washers everywhere.
Andrew Cole
LaserAndy@aol.com