The string is now forming a straight line between the two frets. HOW TO DO IT With the guitar strung and tuned to pitch, press one of the strings both at the 1st fret and at one of the frets near the neck-body joint. Bolt-neck axes with concealed nuts require removing the neck and using a surrogate body and a neck jig-this is a job best left to a pro shop. TOOLS Small Phillips-head screwdriver (to remove the truss-rod cover), appropriate hex key or wrench (almost always supplied with a new guitar). Note: Classical guitars, which use nylon strings, don’t have truss rods. On an acoustic guitar, it can typically be found within the body of the guitar, at the neck-body joint. On an electric guitar, it is usually beneath the truss-rod cover on the headstock or at the body end of a bolt-neck. The adjustable end of the truss rod-either a male or female nut-can be found in one of a few places. Tighten it, and the neck bends backward-this is call back-bow-against the natural curve the string tension imparts, moving the strings closer to the fretboard. Loosen it and the strings pull the neck into a concave bow, resulting in higher action-i.e., the distance between the strings and the fretboard. Virtually every acoustic and electric steel-string guitar built after the mid-Seventies has an adjustable truss rod, which runs the length of the neck and counteracts the tension of the strings to help keep the neck straight.
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