Boats go through so many evolutions. I helped rig the old radical yawl Hutoka back in the '80s and she had wire reel winches for halyards and sheets. What a horror, especiall gybing the main. I proposed making wheel winch handles that could stay in place allowing fast trimming and palm friction easing. It was way too hard to turn the crank fast enough letting it out and handle removal and brake control both militated against that method. So put a plaque up explaining just how insanely dangerous the rig was.
Anyway, judging from those winches, the various sizes of ss 7x7 put in as replacements worked as well as the same size original ungalvanized steel cable. From what I've not too reliably heard and less reliably remember of what old timers in my childhood might have told me fifty five years ago or so, wire running rigging was just oiled and given that these were racing boats not meant to last long anyway nothing much mattered. If you put on ss, it will look right for longer than if you put on steel wire and watch it rust on the exhibit. Whatever your choice, not galvi.
G'luck
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