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The spring and spool is prone to damage if the bump turns into a slam Wear fast and require more regular replacement Give better control over how many lines you use The way they work is bumping or tapping slightly the trimmer bottom on the ground when trimming More complicated and expensive to replace/repair Whenever the line needs replacing, you have to stop the trimmerįinish trimming better as you don’t have to tap the head on the ground

Suitable for huger, more commercial trimmers Making pauses between work fewer and further between Utilize individual line lengths that are threaded or loaded into the trimmer one at a time as needed