I got this from Sail Magazine.com, Cruising Tips - October 2005. Hope it helps. I used a Coat Hanger for the stiff line mentioned in the article with great success. Good Luck
Losing a halyard up the mast is always a big pain in the rear, but if the mast in question has a spare halyard on it, there’s a good chance you can bring the lost halyard back to the deck without leaving the deck yourself. Take a spare line, preferably an older one that is slightly stiff from a little too much exposure to salt and sun, and make a noose with a slip knot at the end of it. Then take your spare halyard’s snapshackle and clasp the shackle around the standing part of your retrieval line just below the noose you made (the slip knot must be big enough that it does not slide through the snapshackle). The noose should be opened as wide as possible without going limp.
Next use the spare halyard to hoist the noose aloft into close proximity with the end of the lost halyard. By twitching your end of the spare halyard and the retrieval line with a bit of creative body English, you should eventually be able to get the noose around the end of the lost halyard. Then all you need do is yank on the retrieval line to close the noose. Pull the retrieval line back down to the deck and both the spare halyard and the lost halyard will come down with it.
SV Other Woman
1976 Catalina 27 # 2684