Weed whackers are useful tools, letting you clean up narrow parts of your yard that a lawn mower can't reach, such as areas ...

Weed whacker or string trimmer, eventually you'll need to re-spool the thing with new line. So you'll want to know the signs ...

College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao 266580, China College of Zhongran Engineering, Hebei Normal University, Shijiazhuang 050024, China ...