Tensioning the battens before downhauling makes it easier to gauge where the correct downhaul should be set. Downhaul also flattens the leading edge and reduces the amount of batten rotation around the mast. Reduced batten rotation is desirable for high wind settings. If there is not enough space for downhauling and you have mast extending from the top, use the adjustable top to raise the sail up on the mast rather than extend your base. Tension the tack-strap until the edge of the sail beside the tack grommet touches the side of the mast.
Slide mast out of luff sleeve without creasing sail.