I have been cutting wood for a few years now and have been getting my chains sharpened by an old man down the road. But when I get them back they last a few cuts and dull again. He uses an elec sharpener. From what I have read on the forum many sharpen by hand using files. Are there any post on the right way to do this and what files are best to use. I am using a husq 261 20" I just bought a new oregon chain today 30.00 So i get to thinking of ways to keep it cutting like new?? Thanks for any help!