Bill if those harken sheaves at that price fit at the bottom of the mast i am really interested. They are a touch wider at 1/2 in. than what the rigtite measures . but close.
Vic - now that I look at the Harken specs, it's only rated for 300#. I don't think that's high enough for the safe working load on the main halyard. So it isn't just the diameter that's different. The class measurer approved the use of ball bearing sheaves, but didn't pass judgment on any particular model number.
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