[pianotech] bushings migrating

Bruce Browning - The Piano Tuner justpianos at our.net.au
Thu Sep 3 08:15:50 MDT 2009


List,
Any suggestions please:
1. I have recently taken over tuning of a Yamaha C3, with unstable tuning
in some notes of high tenor/low treble. Several broken (assume??) strings
had been replaced. The plate bushings seem to have migrated up the tuning
pin. Looks very strange, making it difficult to apply CA.

2. Yesterday I replaced a broken treble string pair.
Plate bushing migrated out with the pin when backing out, but did not go
down when pulling up pitch. Hench bushing is high on pin, almost touching
coil. Tuning is not stable.

I have not had this problem on Upright pianos with plate bushings. What is
going on? How can I rectify this situation?

Bruce Browning
The Piano Tuner.



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