I suggested call S&W because they may have a nightguard cylinder and yoke in stock. If you get a 686 cylinder the finishing may add time to the project, and the nightguard cylinder would match closely. Also don't forget the insurance may be enough to pay for the needed parts at S&W. S&W did not have an answer for me over the phone, they suggested the nightguard cylinder after they inspected my pistol, and did not have a similar replacement to offer me. When I called they told me they would not sell me a nightguard cylinder, but would sell me a 686 cylinder to fit myself.