[pianotech] bushings migrating

[Laura Read]

I had my first encounter with a C3 the other day, also with some concern. I
replaced 2 broken strings in the upper treble and found at least 6 others in
the same area that had previously been replaced. Is this an inherent problem
in the C3? What might be causing it?

Laura Read

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Bruce Browning - The Piano Tuner
Sent: Thursday, September 03, 2009 8:16 AM
To: pianotech at ptg.org
Subject: [pianotech] bushings migrating

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.