Before you commit to going with all rope, you really need to do a few things. First, check the halyard sheaves and see if they have a v-shaped or u-shaped groove. If the former, they'll need to be replaced to deal with a rope halyard or they'll chafe it unnecessarily and cause it to wear prematurely. Also, you'll want to check the exit slots for any damage caused by the wire halyard, and repair it so that it doesn't chafe the new rope halyards.
I'd point out that the Novabraid Polyspec is probably a bit weak to replace the halyard, since it has an SWL of about 300 lbs, vs. 600 lbs. for the spectra 12 strand. Shop around, you can get comparable rope to the Spectra 12 strand for less I'm pretty sure.
BTW, the 3/16 stainless wire rope has a tensile strength of about 3600 lbs.. which is a good match to the 12-strand spectra.
If you can, as gary points out, go to a larger sheave, so that you can use a larger rope that will be easier on your hands. Or you can use a larger diameter spectra or dyneema cored line, like T-900 and then remove the outer jacket for the section that is in the mast and goes through the masthead 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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