Checking Action

• Press down the low E string at the 1st and 13th frets simultaneously. Tap the low E string at the 6th fret. There should be just enough clearance above the fret to produce a slight clicking sound when the string is tapped. If no clicking sound is heard, the neck requires more relief, which is an adjustment to make the curvature more concave. If the clicking sound is pronounced or buzzes, the neck requires less relief.
  
  

Truss Rod Adjustment Screw

• Locate the truss rod adjustment screw for your particular guitar. On some guitars it is in the headstock near the tuning pegs, covered by a metal plate. On other guitars it is inside the body of the instrument, accessed through the sound hole.
  
  

Adjustment

• Use the allen wrench supplied with your guitar for truss rod adjustment. Rotate the truss rod adjustment screw counter-clockwise 1/8 turn to loosen the truss rod for more relief. Rotate the truss rod adjustment screw clockwise 1/8 turn to tighten the truss rod for less relief. Make adjustments in 1/8 turn increments only. Check the action of the strings after each adjustment until the desired action is achieved.
  
  

Follow-up

• Let the guitar sit overnight after adjusting the truss rod. Check the action of strings again the next day and make minor adjustments to the truss rod screw as required.