Sumner, I cant really tell which line is what in your photo......
Lots of lines and arrows
. There are 2 preventer lines and they both attach where the main sheet attaches, top left arrow. I don't think there would be enough leverage if they were at the bail for the vang. Since the boom is off to the port side the starboard preventer is slack above and is shown by the bottom 2 arrows.
The preventer, port side being used, runs forward (top 2 middle arrows)...
.... to a block that is...
... tied to the bottom of the stanchion behind the anchor rode bag above. From there the line runs aft using the base of a stanchion as a fair-lead to a cam cleat to the left of the winch on the cabin top (see first picture). The line then runs down to a cleat on the coaming...
... on each side (arrows in front of Ruth). The cleats might not be needed, but I worried about the cam locks taking the load which can be a lot at times. So far the cam locks have held fine as is evidenced by the slack lines at the cleats. If you go to this link...
http://purplesagetradingpost.com/sumner/macgregor/rigging-9.html
...you can see the jury rigged, one line only and then 2 lines, that we rigged up on the Lake Powell trip after an accidental jibe that got our attention. Lots more info there. There I just tied to cleats and didn't have the cam locks. That also works fine, I just like the quick release and connect that the cam locks provide. That also makes it easier/faster to adjust where the boom is once you set the preventers if a change is needed.
The bad thing about a single line is that you have to get it around the mast each time you jibe and you can't control the boom during a jibe with a single line. Not a big pain if you are running a long time in the same direction and the wind doesn't change. Lake sailing that just doesn't happen so the 2 lines are much better.
With two preventers you can control the jibe if you have someone on the rudder. Pull the boom to center by feeding out the line on one side and taking it in on the other not letting slack in either line. Then at center do the opposite. If the wind isn't real high you can control the boom and not have it take off on its own as you move it from side to side.
I am going to also put preventers on the Endeavour. We now wouldn't sail without them. We are far from experienced sailors. The more experience one gets the more they can push the limits.
If the above isn't clear ask more,
Sum
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