This is what has worked for me in the past. 5/16" for the main and 1/4" for the jib, 3/16" prestretch for the tramp lacing and trapeze lines. And there are lots of colors to choose from. The current lines are too big!! Happy sailing!! Bob 
"The election is over, the talking is done, Your party lost, my party won. So let us be friends, let arguments pass, I’ll hug my elephant, you kiss you’re a $$.”
Liberalism = A brain eating amoeba & a failed political ideology of the 20th century!
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