What you say, Joe, makes total sense to me. I am sure glad I won't have to go up as high as the Windex! I hadn't thought about the sheave on the mast, hmmm, that bears some further investigation.
The marina where Serendipity lives has a skyhook which they use to step masts. What do you think about seeing if I could tie up at the dock and they could scoot me up there high enough to untoggle the forestay and put on my new (as yet unpurchased) forestay? Ever heard of something like that?[/quote]
Why certainly! This is known as "thinking outside of the box." I do this all the time, myself. The big question is, will they allow you to do it or will they have one of their guys do it for liability reasons? either way you may be able to get it done though. Outside of that, if you know somebody who owns a "cherry picker" you've got it knocked.
When I used our YC Aluminum ladder last year to climb my mast, I was able to reach through the rungs of the ladder and grab hold of the mast as I climbed up the ladder. When I got to the spreaders, I took the rope sling that I had brought up with me and tied the ladder off to the mast so it wouldn't move. I had a guy holding the ladder down below me. It was doable for me, but like everything else you need to be extra careful. I guess that doing this kind of a thing is easy for me to say because of the fact that I climbed poles for a living back in the late 1960s through the 1990s when I worked for a power company. Today I shudder when I think back of all the 35',40', and 45' poles that I had to climb, particularly a few 70' wooden poles with lights on them that were too high to reach with a bucket. Thank God for retirement! I promise to never complain about being a "Geezer."

Good luck with that!
Joe