Newly extended line operates more efficiently because of its heavier weight and surface effects. Newer models "auto-feed", where a small cutter ensures the exposed length does not exceed what can be swung efficiently. The operator controls the height at which cutting takes place and can trim down to ground level quite easily.Īs the line is worn, or breaks off, a bump feed string trimmer the operator knocks the reel on the ground so a release mechanism allows some of the line in the reel to replace the spent portion. The motor turns the reel and the line extends horizontally while the operator swings the trimmer about where the plants are to be trimmed. The line is hand-wound onto a reel before the job is started, leaving both ends extending from the reel housing. These lines make solid disks less necessary for tough jobs. Some monofilament lines designed for more powerful cutters have an extruded shape, like a star, that helps the line slash the material being cut the line is thus able to cut quite large woody plants (small shrubs) or at least girdle them effectively. Even round-section nylon line is able to cut grass and slight, woody plants quite well.
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