Use the 2:1 Assembly-Unit with the Harken Reflex Unit 2 furling system.
Order this component for extra sails. Note: Each extra sail has a head swivel and fixed tack terminal.
The standard Reflex furling system for asymmetric spinnakers includes a threaded snap shackle adapter. Use the loop soft-attach/2:1 purchase to control luff tension.
Recommended for use with code zero sails. - See more at: http://www.apsltd.com/harken-unit-1-reflex-2-1-assembly-unit.html#sthash.wtXepD5R.dpuf