The different types of string trimmer heads include the traditional manual-feed, automatic-feed, bump-feed, locking heads, and dual-line. Each manufacturer will have brand-dedicated trimmer heads ...

Some heads use a single line, while others use a dual-line system. The thickness and shape of the line can also vary, which can affect the cutting ability of the trimmer. Another important ...

I found that the bump plate required a firm bump to work: the trimmer only let more line out when you firmly bumped the bottom of the spinning head against a rock or firm ground. The DualDirection ...