Whip off to your library and get acopy of A SEA VAGABOND'S WORLD by Bernard Moitessier.
Page 42 might have a simple way of getting you out of trouble for a short while. He used chain to secure his rigging. If you loosen off your adjustment, cut the wire, add the chain and tighten it all up, it just may work for you.
Get the book and have a look.