Before going into a tapping frenzy please tell us first what scales are we talking about. The last thing we want is for you to continue your tapping dance only to hear several threads later you cracked the scale at the pivot.

Can you post us a close up of the pivot side. We need to look and see what it all looks like. Is it brass, nickel silver? Did you try tapping slightly contouring instead of flat tapping. Are you laying the pivot pin on a steel surface like an anvil, vise, jewelers block or anything remotely hard enough. Are you tapping on both sides...