TIL: The hole on the back of a tuner is for lubrication. : r Guitar Don't Replace Your Strings Restore Them. Every time you play, your strings collect sweat, oil, and buildup that slowly kills your sound. Big Bends GEM TONE String Wipes bring them back Ultra Pure Regular Tuning Slide Lube 9ml Guitar Nut Lubricant Tuner Gear Lube For Classical Guitar, Acoustic Guitar eBay
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best lubricant for guitar tuners Amazon.com: KeyTone Line Guitar Lubricant For Nut slots, Tuning Machines, String Performance : Musical Instruments