How to replace turn signal cam on 65 Dart

I don't see how the cam with the broken ears can be safely removed from the switch without breaking it up. It has the metal collar holding the top piece cam with the lower one with the wires. Can it be separated without breaking it up? This is a manual steering, column shift, 65 Dart. I've got the new little plastic cam; hoping I don't have to buy the whole switch for $120.00.