Lower or raise the action

1. Tune every string to standard pitch (E A D G B E) with the built-in tuner.
2. Hold the guitar the way you play it, or lay it on its back with the neck supported. Measure in the same position every time.

1. Put a capo on the 1st fret.
2. Hold the low E string down at the last fret.
3. Look at the gap between the string and the top of the 8th fret. On most S-style guitars it's about 0.25 mm, roughly the thickness of a business card.
4. Almost no gap, or a gap you can clearly see from a distance? Do the neck relief guide first. Action and relief work together.

1. Remove the capo.
2. Stand the ruler on top of the 12th fret, next to the low E string.
3. Read the gap between the top of the fret and the bottom of the string. Write it down.
4. Do the same for the high E.

1. Keep the strings at pitch. Don't loosen them for this job.
2. Turn both height screws on the low E saddle a quarter turn anticlockwise. On most bridges of this type that lowers the saddle.
3. Turn each screw the same amount so the saddle stays level.
4. Re-tune, then measure the gap between the string and the top of the 12th fret.
5. Repeat until you reach your target, then do the other strings so they follow the curve of the fretboard.

Action too low and buzzing? Turn clockwise instead to raise the saddle.

1. Play every fret on every string, as hard as you normally play.
2. A little buzz you only hear unplugged is normal. Buzz you hear through the amp is not.
3. Buzz on a few frets? Raise that string's saddle a quarter turn clockwise and test again.

1. Changing saddle height changes string tension a little. Tune every string to pitch again.

1. Lowering or raising the action changes the intonation slightly.
2. On each string, compare the harmonic at the 12th fret with the note fretted at the 12th fret.
3. More than a few cents apart? Follow the intonation guide.