If you're a seasoned pro at sharpening, feel free to stop here. If not, maybe this'll be of some help. Today I bought 2 of the "Two In One" sharpeners made by Stihl. Unlike every thing I'd tried, these devices worked with consistency. First up, I sharpened the old chain on my Stihl MS 180c, then did the same on my Husky 445. Both chains were restored to factory fresh condition, if not better. Both saws tossed out big chips. No sawdust or grits. Both saws cut aggressively and straight. Over the past several years, I had tried Stihl's sharpening kit; Husqvarna's kit; a Granberg file and joint; and a Craftsman dremel type sharpener. Bottom line, the Stihl 2 in one is a superior product. With it, a gorilla could sharpen a chain - consistently and fast. I paid about $40.00 for each device. They came with 2 Stihl files. So about $33.00 net. Worth many times that to me, just in reduced frustration!