I showed in this video how I lowered the nut slots height due to high action on the first fret of my Yamaha FG700MS acoustic guitar. I also showed various nut slot files that can be used for this job. Check it out and let me know how you do it on your acoustic guitar.
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Gears used in this video:
Tools: Nut slot files
Guitar: Yamaha FG700MS acoustic guitar
Microphone: Audio Technica AT2020 condenser microphone
Camera: Canon EOS M50 mirrorless camera
Audio Interface: Saramonic Smartrig for connecting condenser microphone to camera