Okay! Thanks Revo. That makes sense. I do have the diagram, and it kind of confused me.
So.. I have it all together now on the living room floor. Looks good! Ran out to the garage to check for the hook below the mast hole, and there it is, right where it should be. However, it seems to me that the bungie loop would have to be pulled extremely tight to stretch that far, if that is even possible. Since I have your marvelous brain to pick, I've taken a picture, so you can see what I'm contending with. The ruler represents the depth which the mast can be inserted into the mast hole. The quarter represents the location of the hook for the bungie loop. As you can see, that is a long way to pull the loop. It would be extremely tight and pull very strongly on the point where the top of the mast is held by cloth. What do you think? (Edited to add: the mast is inserted all the way into the sail and there is 23 inches of mast that is not covered by sail. About 9 of that goes into the mast hole.)
Also, do you have anything attached to your mast pieces to save them if they fall overboard while taking the sail down out on the water?
Thanks again for your help.