RWTF, it is doubtful that your bushings with the retaining screws will work in another gun. They will screw in but a good chance they will not orientate to the existing retaining screw holes. Since these are custom fitted to every gun, and need to be filed to fit as they are set at an angle.
Yup 15% face bevel-- main two things about bushings, if the threads are correct and not "boogered" and the OD of the bushing is the correct size, then the rest it fit and finish filing-- the bushings are not under stress, so 1018 mild steel or even 12L14 screw machine stock is fine-- I have two 12 Gauge pre-1913 Grade 2 Smiths- both with bushings and the copper retaining screws- one made in 1902 and one in 1910- both R or std frame guns- and with neither of each can you interchage the bushings, or for that matter, the lock plates- close- but not right- hand fitted guns, yessiree!
