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Step 1
Inspect your guitar pegs by moving them to see if they turn as they are supposed to. You can also check the tuning at the same time. If any of the pegs are loose or damaged, mark them in some way and continue on with your inspection.
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Step 2
Tighten any pegs that are not completely damaged and make sure they are still in good working order after tightening. If there are small cracks or other minor damage, repair them with wood (or other material) glue or a guitar peg repair kit. Purchase new pegs for the ones that are beyond actual repair.
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Step 3
Install new pegs to replace the pegs that are damaged or broken. These can be purchased at a guitar or musical instrument store for a reasonably low price, depending on the pegs you are using and the guitar make and model they belong with.
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Step 4
Remove the strings and the four small screws on each side of the tuner that hold it into place. Look at the new tuner peg piece and see that the holes of the new tuner peg match up to where the screws go. If they do not, you will have to plug the old holes and drill new ones. Then put the new tuner into place and screw the small screws back in. Re-string and you are ready to go. Replacing the entire tuner is an easy way to fix or update all the tuning pegs at once.
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Step 5
Tune the guitar using the new or newly fixed pegs. It is important to make sure the pegs contribute to proper tuning, or there may be an additional problem with them to explore. Once tuned, play a few chords to make sure the entire range of sound is correct.
