• All pianos have a hardwood panel (or "block") where the tuning pins are anchored.
  • The pinblock is precisely mated to the cast iron plate. This is necessary to support the 35,000 to 40,000 pounds of cumulative string tension when a piano is at full pitch.
  • The fit of the 225 +/- tuning pins in the pinblock is critical. The holes bored into wood must be "just right" in relation to the diameter of the tuning pin.
  • Too tight, and it is difficult for a piano tuner to do their best work in tuning the piano.
  • Too loose, and the tuning pins will have a short durability to hold the tuning pins against the average tension of 160lbs. per string.