So, over time normal wear-and-tear can take its toll. The slots can become misshapen and/or become dirty with grit and grime after years of use. All these factors can lead to string breakage at the nut. Just as sharp tuning posts can act like little string cutters, dirty or misshapen nut slots can break strings too.
Consequently, does tuning guitar break the strings?
Guitar strings break because of burred tuning posts
If your guitar strings are always breaking right near the tuning posts—you guessed it—your tuning posts might be to blame. Rarely, guitars come from the factory with burred edges on the tuning posts that can cause breakage, even on a brand new guitar.
Furthermore, how do you not break strings when Restringing? Make sure the slots are sized appropriately for the strings you’re using. Also, make sure the slots are smooth. Nut lubricant is always a good tool to use to make sure that strings aren’t binding in the nut slots.
Simply so, why does the G string always go out of tune?
“The height of the G slot in the nut can really impact things,” Pullen explains. “If it is too high, that extra distance you need to press the string down to fret the note will bend it out of tune.” Additionally, the string gauge needs to be matched to the guitar’s scale.