You have to find the specs for your new arm. Who mounted it??
If you can tell me the effective length of the arm (distance from pivot axis to stylus) I can tell you the approximate overhang. The Feickert protractor will work if you feel like spending the money.
If you can tell me the effective length of the arm (distance from pivot axis to stylus) I can tell you the approximate overhang. The Feickert protractor will work if you feel like spending the money.