I achieved a 2:1 purchase in the board line by adding a Harken #82 single
block to it. I cut the line just in front of the deck-attached block and
installed the new block in an eyesplice to the board-connected segment of
the line. Double check correct operation: the new block almost reaches
the existing block on the bulkhead when the board is down. When the board
is up (as shown in picture below), the new block moves to within four to
five inches from the deck-attached block.
Since we need a few extra feet of line with this arrangement, I ran a new board line through the new block and terminated it with a Harken #200 cleat mounted on the board-well facing the inside of the cockpit (see picture). I mounted mine on the front edge -- it can also be mounted on the rear edge of the board-well by extending the line some more. A stopper knot in the line (and a low-profile eyestrap on the cam cleat) prevents it from coming loose.
A side benefit of this modification is that I can now change the board depth by adjusting the length of line at the new cleat!
1999 UpdateIn early 1999 I updated the system again and copied the one now being used by Melges. However, I improved on their arrangement by keeping the board-height adjustment capability. The picture shows the finished product.
A short 1/8" Vectra line connects the board to a floating #82 single block. Board line reduced to 1/4" diameter instead of 3/8" diameter. A double block replaced the single block visible in the picture of the old installation. The thinner line moves very smoothly through the blocks.
Good luck and...See you on the starting line!