A mill bastard file is the old-school, no-power method that experienced lawn care veterans swear by for producing a superior, controlled edge. It takes more time but gives you the most tactile control over the bevel angle.
Experienced sharpeners consistently say hand-filed edges beat machine-sharpened ones for quality. If you're patient and want to learn proper technique, a $10 file will outlast any plastic drill attachment and produce a better result.
“Just use a mill bastard file and call it a day.”
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“I just use a hand file. Only takes a few minutes.”
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“Hand file from HF here. Sharpen about 2-3 times a season. Takes some time but no issues.”
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“A hand sharpened blade always has a superior edge to a machine sharpened blade.”
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