I think there is more to my N20 jib halyard, it has the S hook and the ring up top to hook into. It works well when hoisting the jib. Problem is it is difficult to get it undone to bring the jib down. The S hook has a small hole drilled in it. Not sure how this is supposed to work but I'm sure someone here does. Thanks.

Tie one end of your halyard to the loop on top of the S hook(this is the up side line) and take the other end and pass it through the small hole in the S hook and tie a large bowline. The halyard runs up through the ring to the thimble and back through the ring and back down. I also like to pass the line though the triangle right above the spin pole to keep everything neat. The line is one line tied in a
loop using the S hook. To put the jib up hook the S hook to the top of the jib with the top of the S hook facing the back of the boat and put both lines in the zipper luff. Pull the halyard up and zip the luff at the same time ( tying a short piece of line to the zipper makes it easier) keep raising the jib until the S hook just goes through the ring and then pull down on the jib and it should hook. To take it down pull the halyard up just a little (the same side line you used to pull the jib up) until the S hook is above the ring and then pull a little on the other side of the halyard to pivot the S hook off the ring and pull the jib down. Some times you have to pull the jib around to the front of the boat. Don't use the cheap line that comes with the boat as it will break ( don't ask me how I know).

Ok, I'm trying to picture this. Why do I tie a bowline at after the small hole? I understand tying one end to the loop at the top of the S hook, and the ring and thimble at the top of the forestay. But still not able to figure out how to use the drilled hole and bowline.

My halyard goes: Loop on S hook, locking ring, thimble, down.

Does the other end go through the triangle and back to the drilled hole on the S hook?

Yep the other end goes through the small hole in the S hook to make a continuos
loop. The large bowline through the small hole is to spread the load out on the line (you can tie just a stopper knot but it seams to wear faster and break. If you look at the S hook with both lines attached you can see how the end of the line with small hole keeps the S hook from engaging on the ring so it will release.

Ok got it. That will be nice not having to pack the extra halyard line away too. Thanks!

So,
To release, or unhook the halyard, you pull up on it, then pull the other line (the one that's in the little hole on the hole end), to rotate the hook, which enables it to un-hook, and drop the jib?

I'm asking 'cause one of the skips I sail with often has trouble when trying to take down the jib.
Actually, it also seems that it it hard to get hooked in the first place.

I realize this system is supposed to be better, but apparently a simple step is missed, and the system seems to suck most of the time.
When trying to 'hook' the jib in rigging, the line going from the end of the hook, back down to the bottom seems to 'cover' the hook and keep the ring from going in the hook.

I don't own a I20, yet anyways, but I stayed at a holiday inn express last night.

David,
I'm sure you know how to work this system well, please expand on what I've mentioned, so next season, I can make this part of rigging much easier on my skipper.
I do realize it should work well, but it rarely does, often having to put the boat on it's side, just to get the jib rigged, or off the hook. And that's not off the hook!

I swing the jib to either side to hook or unhook. It works great for me. The ring can be in a slightly different orientation and sometimes you have to swing the jib to make it work.

We've had repeated problems getting the system to hook or unhook. Really annoying to struggle with it for 10 minutes before giving in and flipping the boat on the beach...
It seems the ring on top, which is on a short bridle, tangles around the forestay. We recently tied the bridle to the forestay just above the ring, and have had no more problems.

Without using the drilled hole we have problems getting the jib unhooked, but have always been able to work it without flipping the boat. We do pull the clew around from side to side while constantly hoisting and pulling the jib tack. I am excited to try the correct way, I bet it works much better.