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Re: Mainsail halyard replacement
Typically, you'd replace the halyard with the size of the rope tail from the old halyard.
Note: Many people will tell you that using regular rope on a wire halyard sheave at the masthead will result in damage to the rope and premature failure. The sheave could have sharp burrs from the wire cutting into it, also the "V" in the sheave for the wire stresses and deforms the core of the new rope halyard.
I'm not saying this isn't true, but after running Sta-Set and VPC rope halyards over the wire sheaves on my Pearson 30, I had no issues and have sailed many miles.
Alacrity, 1981 Tartan 33 #168