After finishing the first CSN&Y LP, and due to constant issues with hum from the (notorious) DeArmond single coil, Neil pulled it and left it at a guitar repair shop to hopefully resolve the grounding issue while substituting a Gretsch Filter-tron for a short time. The guitar shop folded and the DeArmond disappeared with the owner. By 1972-73 he had switched to a '62 Firebird pickup, exchanged the Grover tuners for Schaller M6 tuners, the B-3 tailpiece for a B-7 and installed a mini-circuit switch to by-pass the on-board electronics. Eventually he had additional work done necessitating the addition of another aluminum back mounted cover plate and a maple inlay was added to the back of the neck running all the way to the end of the body.