TIL: The hole on the back of a tuner is for lubrication. : r Guitar Amazon.com: KeyTone Line Guitar Lubricant For Nut slots, Tuning Machines, String Performance : Musical Instruments Best lubricant for these tuners WD40, Dr Ducks, Silicone? Music Nomad TUNE IT String Instrument Lubricant 10cc 10mL MN106 Tune Up Your Gears
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