..The problem is you and anyone else that buys these sharpeners haven't probably been taught how to sharpen a saw by hand (no offense).. I mean look, the trees guys that trim for power lines (trucks that you may see along the road), loggers, etc..They don't use these tools.. All it is, is a simple file.. If you know a logger..Ask him to show you how to sharpen a chain..Thats how I learned..Before knew, I was cutting with a dull saw thinking it was sharp
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I know a ton of loggers (I sell to them). Yes, they hand sharpen in the woods. But they keep extra chains which are mechanically sharpened in batches back at the shop. The hand file is for touch up in the woods because it's cheap, easy, and convenient. For them it's not a replacement for a proper setup on a bench. Your mileage may vary in your neck of the woods. One thing I know is the "right" way to do it varies by region.