Tip: Rocket Science
The SQ 9.3 sail comes with a "Rocket" and key to tension the top batten. The rocket slips loosely over the end of the batten and then the webbing loops at either side of the batten pocket fit over the fins. The batten and rocket will stay in position when under tension, but it's hard to roll the sail with the batten in place. So if you remove it, consider either taping the rocket to the end of the batten or drill a small hole in one of the fins and tie the rocket to the batten loops. Tie the key to the mast strap. If do you loose it, Weta have replacements available.