Hello. I recently bought a 1981 O'Day 22. My halyard is jumping I to the sail track when I try to pull the mainsail down when trying to put the sail away. Pulling it up is fine. When standing directly under the mast holding both ends, I tied a pigtail to one end to test the halyard and it will not pull down more than 6 inches before jumping. If I get out of the boat and stand behind it at a considerable angle it will flow freely. I'm baffled and it's labor day!