I start with this, an A-440 tuning fork, and then proceed to tune the rest of the piano by ear.Installing a new set of rubber donut grommets on a spinet piano. The old ones had deteriorated and were crumbling away.
Tuning a very nice grand piano
Tuning and regulating a console piano.
Replacing two broken strings on a spinet piano before tuning. All of the keys and the piano action had to be removed.
Reinstalling the keys and action after two broken strings were replaced.