you have been duped, just like myself. you dont own a troy-bilt, you own an MTD mexican manufactured trimmer. Troy-BIlt whored their name on this product and there is no answer to your question. I have fiddled with this for 3 months and am beyond p*ss*d off about it. If you call Troy-Bilt, they won't help you either; they don't care either. Better off buying a Ryobi or Echo and saving the heart-ache..... Gosh i wish i could "personally" deliver this p.o.s. that i have to the Troy-Bilt CEO ; it'd be a fun conversation...... Jerry, Austin, TX
Jerry, Austin, TX, May 2009