Guitar Action Trick

My black Alvarez guitar, which was my work guitar in San Antonio, had been in its case for over ten years until I got it out recently. When I restrung it, the A string buzzed a little bit on the first fret, but no others. I've always avoided sanding down frets, because there's no going back. So what I did was snip a short section of the unwound end of the A string and put it in the groove in the nut, under the A string, raising it just enough that it doesn't buzz on the first fret anymore. If there's a difference in the sound, I can't hear it.