Ive been using Homelites for 6 yrs. Cant see spending 300 bucks on something that Lites can do. Plus if something major goes wrong, I take it back to Home Depot and get a new one. Simple. To answer your question, I take off the string guard to allow more string to advance. Also the bump feed knob gets worn down, that also will hold back string. I use the WD40 method too.