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Lazy jacks allow mainsails to be reefed or dropped with ease, by retaining the sail between lines running from the mast (near the hounds) to the boom. These lines can be slackened while sailing to avoid restricting sail shape. Lazy jack kits for sailboats up to 40+ feet include line, blocks, eye straps, cleats and fasteners. Some kits offer chafe covers! Get the most out of your DIY installation: Defender's lazy jack systems offer full instructions on how to install the lines on your mainsail.