I put a 40 inch bowsprit on Anona, a 2000 J-46, and bought a Quantum code zero and a furling A2. These sails are fabulous. We can carry the A2 above 70 degrees in flat water. The boat flies and we love it, added more than a knot. BUT the 2:1 warpspeed halyard that the rigger recommended is a problem, ALWAYS. Something about the way it rolls over the sheave at the top of the mast causes it to accumulate torque (twist), which shows up in the loop between the head of the sail and the sheave. It generates heat passing thru the Facnor swivel and the last twenty feet require hard winching. The built in FACNOR swivel at the head of the sail doe NOT swivel out this twist. The Facnor furler (4500) works great, but came from the factory with a defective rachet, and since it was new to us, we didn't realize it was defective for a year's worth of sailing. The owner is 45 feet away from this evolution, the bow man needs to understand the features of the furler.
When we want to lay this sail down on the deck, say while working upwind, the double halyard makes this evolution harder than it needs to be. It takes at least two men to pull this double rigged halyard down when the boat is heeled, not just the extra length, but the twist tooI make it hard. I see no advantage to the double halyard. This year I'm going to use the other halyard which is single.
Fred Hawes