Why does my G String keep going 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.
Why does my banjo keep going out of tune?
A number of our customers often come to us and say "my banjo won't stay in tune". ... 99 times out of 100 the problem is simply that the screw which holds the tuning peg has become too loose. To fix this you just need to tighten the screw which runs through each tuning peg. Don't crank down the tension.