Join Date: Feb 2010
Location: Narragansett Bay
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Do you have a furling head sail, a traveler? Even the specific blocking used for the mainsheet will drive a big part of the answer. Not enough info to give a good answer.
It's also unlikely that each line will need to be the same diameter and possible not the same material.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.