Yesterday we were trimming some shrubs and my main amigo told me that the hedge clippers seemed to need sharpening. He said the big leafed stuff it cut fine, but the smaller-leafed stuff (smaller hollies-yaupons, helleris, etc.) it seemed to tear the leaf as opposed to actually clipping it. We don't use these much, and I'd have to pull a receipt, but I'd bet that they're about a year old (I keep pretty new stuff). FWIW they are the stihl clippers mounted on a FX90 engine. They are the ones with the articulating head. I guess my question is can I sharpen these? if so, how?? if not, what can I do to get a better cut??? I really don't want to buy a new head, but if that's what I gotta do, then I guess that's what I gotta do....LMK-and thanks!