Thanks to Brett Hasbrouck, the General manager at Hayn Marine, and Robert Jones of Defender Marine, I received my replacement crown rings in the mail. Now it was time to get to work. Don Casey (This Old Boat) says a furler installation should take a professional rigger about six hours.
An 'eye' fitting was attached to the top of the new wire, and a turnbuckle rod to the bottom, being very careful to get everything the same overall length as the original stay.
The Harken manual has a length calculation sheet that makes the whole process very easy.
To cut the wire I had thought about using my grinder with a cut-off wheel, but was reluctant to heat the wire ends, so instead cut the wire to length by taping it, wedging it in a board with a 7/32" groove, and sawing through with a fine tooth bi-metal hacksaw blade. The job was easy and left a perfect, smooth cut in the wire.