Sustain rods

[David ilvedson]

> Date:          Fri, 16 May 1997 10:02:57 -0500
> From:          robin fox <foxqx001@gold.tc.umn.edu>
> Subject:       Sustain rods
> To:            pianotech@byu.edu
> Reply-to:      pianotech@byu.edu

I don't know what kind of piano you are referring to (brand) or
is a in general question.  I run into this with Kawai uprights.
They have two levers connected to the sustain pedal.  One for
the bass dampers and one for the tenor/treble dampers.  You have
to keep the lock nuts tight on them once adjusted.  Check out
Bill Spurlock's articles on upright damper replacement and his
PACE damper articles.

ilvey
Pacifica, CA

> A rather common problem around here is upright damper/sustain systems out of
> whack, the familiar uneven rise of the line of dampers. After tightening all
> relevant hardware (which doesn't usually help much) I regulate it. But I don't
> quite understand why this develops or how to fairly simply solve it other than
> by regulation.
>
> Removing the rods to see if they're warped might take quite a while; and if
> they are, what then, just replace and regulate anyway? Is straightening one
> of these rods practical? Or is the problem compression of the felt in the
> mounting brackets, which doesn't seem like it could account for all the
> out-of-lineness.
>
> Thanks
> Robin Fox
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