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A: I use Stringliner Pro Reloadable #18 Nylon Construction Line, 250’ (1/4lb. 155lb. test). I buy it at my neighborhood True Value hardware store. There may be one in your town, too. If not, it's available online at http://www.hardwareworld.com/250ft-Br-Yellow-Pro-Reel-pEC0SDZ.aspx. I like it because it's strong and doesn't come unbraided when I'm handling it.
Hope that helps. Happy Holidays. - Kenny