Steinway, Model M Grand knocking rattle noise

[Mark Story]

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Arthur,

Rebushing it may need, but you might be able to tame the damper wire by
bending it to increase (or apply, if there is none) the bearing of the wire
on one side of the bushing. The S&S service manual says that the bass damper
wires should bear “slightly” on the treble side of the bushing and the
treble on the bass side. I’ve never really liked this specification – (why
not just bush the rail correctly and let the wire ride freely up and down
and let the guide rail, guide the wire rather than support it?) but there it
is. This can be tricky though, because when you bend the wire for any reason
you will have to compensate for it with another bend at the correct location
on the wire to insure that it works correctly. If you’re not quite up on
damper wire adjustment, you might want to get some help and maybe practice
on an action model. I think it’s something that anyone that tunes grands
regularly should know, because it’s a pretty common problem source that many
tuners avoid like the plague.

Mark Story. RPT
Eastern Washington University
Cheney, Washington

-----Original Message-----
From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]On Behalf Of
ARTHUR CHICKERING
Sent: Wednesday, August 16, 2000 1:31 PM
To: pianotech@ptg.org
Subject: Steinway, Model M Grand knocking rattle noise

List,

I have a customer with a Steinway M Grand which has several notes in octave
3 that make a rattle or knocking noise when played.  There is a lot  of
space around the damper wires at the guide rail bushings.  The damper can be
easily moved from side to side and back and forth.  When the damper lever
strikes the upstop rail the wire rattles and knocks against the guide rail
bushing. If I play the note with a little pressure with my finger on the
damper wire the noise stops.  I am looking for adjustment or repair ideas to
solve this problem.
Do I need to raise the upstop rail, adjust key dip or rebush the guide rail?
Thanks,

Arthur Chickering
PTG Associate
Rockland,ME.

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