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2-WAY TRUSS ROD ADJUSTMENT
Carvin guitars come with a 2-way adjustable truss rod, allowing you to add the proper amount of forward bow, even to a neck with an excessive reverse bow condition. You can check the neck yourself for the proper amount of forward bow. You will need a straightedge about 18” long and a feeler gauge set. Tune the guitar to the proper pitch and place the straightedge edgewise on the center of the fingerboard so that it is resting on the first and last fret. Now take the feeler gauge set and check for clearance at the 7th fret. Viewing from the tip of the headstock (with the frets facing away from you), the truss rod nut must be turned left (counter clockwise) if there is less than .005” clearance at the 7th fret. If more than .015” clearance, the truss rod nut must be turned clockwise. The optimum forward bow is .010”. Turning the nut to the right (clockwise) will reduce the amount of forward bow. To make adjustments use the 4mm hex wrench provided with your guitar. A 5/32” hex wrench will also work. Turn the nut 1/10 of a turn and recheck. Do Not force or over tighten the truss rod! Note: If you have just received your Carvin guitar and the string action is very low with buzzing frets, then chances are the neck needs adjusting because of a backbowed condition sometimes caused during shipping. If this is the case then remove the truss rod cover with a small phillips screwdriver. Turn the truss rod counter clockwise until you have .010” forward bow. This is about the thickness of a playing card. If you don’t have a straightedge or feeler gauge set, you can achieve great results by pressing one of your outside strings down at the first fret and 24th fret and having a friend slide a playing card between the 7th fret and the bottom of the string. The card should slide under without lifting the string up. Adjust the truss rod accordingly."