How to use grover locking tuners on a guitar

Written by michael black
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How to use grover locking tuners on a guitar
Regular tuning pegs do not lock, thus making them prone to go out of tune. (tuners-guitar image by Jeffrey Zalesny from

Guitars that are played hard have a tendency to go out of tune (especially if the vibrato bar gets a lot of use). A lack of tuning stability can be one of the most frustrating things for any guitarist deal with. While several possible remedies for this problem exist, including locking tremolo systems and locking nuts, locking tuners are by far the simplest way to shore up the tuning of your instrument. Grover is one of the industry leaders in locking guitar tuners.

Skill level:

Things you need

  • Guitar with Grover locking tuners
  • Guitar strings

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  1. 1

    Determine what type of Grover locking tuners you have on your guitar. If your tuners have a thumb screw, they are Roto-Grip Locking Rotomatics. If there is no screw, you have Original Locking Rotomatics (the original Grover locking tuner).

  2. 2

    Turn the extended tip of your Original Locking Rotomatics tuners until they click into place. Make sure that the string hole is positioned away from the tuning knob. This will allow the tuners to lock properly.

  3. 3

    Insert your first guitar string through the hole in the tuning peg as you would on a regular tuning head. Pull the string until it is mostly taut (leave a little bit of slack in the string).

  4. 4

    Begin tuning the string. Original Locking Rotomatics tuners will lock themselves. Watch the tuner as you tune, and take note of the fact that initially, only the "locking cam" is turning. Once the cam locks, the outer post will continue to turn as you tune your guitar.

  5. 5

    Repeat until your guitar is fully strung and in tune.

  1. 1

    Run the first string through the hole in the tuning post as you would with a normal set of tuners. Pull the string until it is fairly taut.

  2. 2

    Screw the thumb screw until it is tight. Be careful not to tighten the screw too much.

  3. 3

    Repeat with your other five strings and then tune your guitar. Once you are in tune, make sure that the thumb screws are still tight.

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