Re: main sail blown?
The first reef is locked onto the boom at the tack with a hook.
there is a set of slugs on the lowest part of the sail that are attached to the sail through a small rope to create a gap. when I put a reef in, I usually have to let a couple slugs get off the track to be able to bring the tack ring onto one of the two hooks at the gooseneck. I suppose I could try to work on the tension of this rope.
Finally, the boom itself in on a track. I can control how high or low I want it to be using a tensionning line at the bottom of the gooseneck going to a cleat on the mast (before tensionning the halyard).