I fly an asym from a sock on
Ananda, off of a 2'
carbon fiber aftermarket sprit with a bobstay to take the sprit tension.
I considered a furling system but my sailmaker was pretty pessimistic about a furler working on the J-30 - the spinnaker halyard exits basically at the forestay, which is way too close. A furler needs at least 6-8 inches of clearance to operate properly and preferably even more.
The sock is great, though, and the sail flies beautifully:
/![[Linked Image from i.imgur.com]](http://i.imgur.com/PsOqBYS.jpg)