"Dressing the end of the frets is a job for a file and some steel wool. Make sure you cover your pickups so the tiny metal shavings and fragments don't get stuck to the magnet poles in your pickups. If I were doing this for the first time, I'd use masking tape to cover the wood on either side of each fret around the edge of the fretboard."
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Use at least 3 layers of tape as a saftey margin in case of file slips.
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