Feldman Guitar Works is an instrument repair shop in Roanoke, Virginia specializing in Owner Alan Feldman specializes in fretwork and individualized action setups, plus repair of accidental damage, finish and inlay work, and hardware/electronics installation on Martin, Collings and and other guitars and mandolins.. 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.