what does a truss rod do
The truss rod is part of a guitar or other fretted, stringed-instruments that stabilizes the lengthwise forward curvature (also called relief), of the neck. Usually it is a steel bar or rod that runs inside the neck, beneath the fingerboard.sually, the truss rod of a brand-new instrument is adjusted by the manufacturer before sale. Normally, turning the truss rod's adjustment bolt clockwise tightens it, counteracting the tension of the strings and straightening the neck or creating a backward bow.