I bought an electric one from amazon and it works well. At $40 it pays for itself immediately. Hand filling works if you can file both sets of teeth consistently. I would inevitably take more metal off the teeth facing one direction, which would result in crooked cuts. Files are good for a light touch up but I prefer this machine. I have 4 chains that I rotate when cutting. When they all get dull I'll run them through the machine and am back in business.
Here's the sharpener:
Here's the sharpener:
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