running new halyards

I guess you have done the job now, so you probably don't want this advice anyway.

I change out my halyards for 6 mm polypropylene line every autumn, then swap them back every spring. I use stainless steel wire to attach the two, easily pushed through each rope. It's fine TIG welding filler wire, about 1/32 inch, quite stiff. A hook in each end is sufficient to hold the two together and in about 15 years of doing this I have only once lost one, when the polypropylene twisted and jammed and I gave an excessively robust jerk to get it free. I virtually always do it with the mast up but have done with it down. On balance it's probably easier with it up, as it is then obvious which one goes where.
 
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