I know that there have been a million threads on this subject but I just have to run my mouth a little about Sivey grinders. I just had the chance to grind and then use for a substantial amount of time (probably went through 2 gallon of fuel). I was using a 2171 J-red and a 395 Husky and could not believe what an edge it put on my chains. I know, someone is going to write and tell me if I was a real man I'd use a file. My answer to whoever writes: You file, I'll grind! If you have more money than brains ( I'm not sure I have either) buy one of these things. Kind of a crude looking thing but the folks at Silvey have this game figured out. Ok I'll quit. All those of you who can file better, get writing.