Fret Boss Guitar Works is an instrument repair shop in Staunton, Virginia specializing in Offers personalized setups and repairs for all fretted instruments including guitars, banjos, mandolins, and basses, serving Staunton, Harrisonburg, Charlottesville and and the Shenandoah Valley by appointment.. Whether you need a quick setup, fret work, or a more involved restoration, their team brings professional bench experience to every instrument that comes through the door.