As lawn and garden equipment goes, none seems to have as many names as the noble weed trimmer — aka weed wacker, weed eater, weed cutter, string trimmer, strimmer or, in some circles, brush trimmer ...

Under normal use, you need to advance your string trimmer’s nylon cutting string whenever the tool isn’t cutting effectively. That happens every few minutes or even quicker in tall grass and weeds.

Replacing the line on a weed whacker is one of those tasks that feels more complicated than it should be. Many traditional string trimmer heads require full disassembly, winding the line manually, and ...