1. make sure the ring is hanging aft of the forestay when you rig the boat.
2. Make sure the 's' has the opening to the rear when hoisting. when it goes thru the ring, just pull down to catch it.
3. When de-rigging, loosen the luff tension, and pull up the halyard slightly, the down quick to get it thru the ring. Pullin the clew to the side often helps here.
Good luck, hope this helps.