Tying two lines together through the grommet in the sail always seemed like to much trouble for me, so I did a simple conversion. I took one of the line and tied a loop in it. On the other side I added a ball to the line. Now all I have to do is push the line with the loop through the grommet and wrap the loop around the ball on the other side. Once the slack has been taken out of the downhall ther is no risk of the system coming undone.
Alec