The Martin Six String Customs Holy Grail harness uses CTS 550K short-shaft audio-taper potentiometers with 10 percent tolerance to give the pot a gradual increase in volume through the entire shaft rotation. Its pots are grounded with 20-gauge bus wire and have been hand-aged, and the harness uses ’50s Sprague Bumblebee .022/400V 20 percent capacitors with hand-aged sleeving. It is mounted on a flamed-maple template finished in nitro lacquer. Learn more at martinsixstringcustoms.com.