Not sure, but if you're going to go through all of this, why not replace his wire-to-rope halyards with all line ones. A 5/16" dyneema or spectra core line would be stronger than the wire and the 3/8" he's got currently. It'd also weigh a lot less and stretch less. The only caveat is that you'd have to inspect the masthead sheave and make sure there are no burrs or damaged areas that might chafe the new halyard. You'll probably also want a new sheave with a u-shaped groove profile on the sheave.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.