I will try to explain the boom in words, but I bet it becomes pretty confusing.

1. One the end with the outhaul car there should be a cheek block on one side and an eyestrap/fairlead on the other.

2. On the outhaul car there should be pulley sleeves under the main sail connection point. The axel of these sleeves should be vertical.

3. Half way down the boom on the side that has the cheek block, you should find a cleat, normally a "Camcleat" brand cleat. Just above the cleat should be another fairlead / eye strap.

What ends up happening is a cascading 4:1 outhaul system. You will need the following items:

1 - Harken air block.
2 - 3/16" by 3' pieces of rope.

Directions:

1. Take both pieces of 3' x 3/16" rope and tie a knot at the end of each.

2. Take one piece of the rope and run it through the eyestrap at the end of the boom on the opposite side of the cheek block.

3. Continue to run this piece through the sleaves on the outhaul car below the mainsail attachment point.

4. Continue to run this line through the cheek block on end of the boom on the opposite side of the eyestrap.

5. Now tie the Harken airblock to the end of this rope. If you pull on this rope you will see that your outhaul car will move toward the end of the boom. If this is true, you have done the first 5 steps correctly.

6. Take your second piece of 3/16" x 3' piece of rope and run it through the eyestrap above the camcleat in the middle of the boom on the side of the cheek block and your new Harken air block.

7. Continue to thread this line through the new Harken air block tied to the end of your first line.

8. Continue to thread this rope through the "Camcleat" under the eyestrap in the middle of the boom on the side of your air block and cheek block.

Now you should be able to cleat in this line to hold the outhaul car in whatever position you like. One thing you might also be missing is a piece of bungie that pulls the outhaul car forward. Let me know.