The piano’s tuning pin block is the ‘heart’ of the piano. Made from pieces of cross laminated 1/4 sawn hard rock maple wood, after time the wood cracks and de-laminates and becomes incapable of holding the tuning pins in place, thus making the piano un-tunable.
Here you can see a crack in an old pin block. The crack in the block prevents the piano from holding a tuning.
Manufacturing a new tuning pin block custom to the piano.
Drilling holes in new pin block.
New pin block manufactured and installed.
New tuning pins installed, driven into the new pin block.
Replacing the tuning pin block is part of the rebuilding / restoration process.