Thanks for the explanation. I guess both my dock lines and my sheets are double braid. I have some three-strand line that I use for backup dock lines right now, but it's probably too small for that job, and I really don't like it... it's hard to work with, and ugly. After I made my first post, I checked prices on Defender and they're quite a bit cheaper even after WM's discount. I just checked out RWRope, but they don't list prices on their website. As a rule, I try to avoid doing business with companies that don't list prices.
1979 Gulfstar 37 Laissez Faire