Gross-trim/fine-tune mainsheet systems are easy to install and use. For fast trimming, pull both tails of the mainsheet. For fine-tuning, pull one tail and the purchase doubles. Two-speed mainsheet systems come in three configurations for boats from 22 feet to 39 feet (6.5 m to 11.8m), with mains as large as 3502 (32.4 m2). 

*Line not included.

The West Advisor

The West Advisor articles have answered boaters' questions and provided solutions to boating problems for more than 20 years. West Marine has compiled one of the Web's most comprehensive collections of technical boating information articles.