[pianotech] singing sustain, what to do?

[Mike Spalding]

Paul,

I already did lube the tray pivot centers and the pitman/tray contact, 
even though I was fairly sure they weren't responsible, but since I had 
them out and accessible anyway, why not.  Mclube or Goose for the 
contact points of wooden underlevers and soft felt damper tray?  Without 
considering surface roughness of wooden underlevers?

Paul T Williams wrote:
>
> Try some McLube or Goose Juice at the contact points. that should 
> clear up the noise. Also check the bushings.. lube those as 
> well....and the pitman/tray contact point!
>
> Paul'
>
>
> *Mike Spalding <mike.spalding1 at verizon.net>*
> Sent by: pianotech-bounces at ptg.org
>
> 01/30/2009 05:28 PM
> Please respond to
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> 	[pianotech] singing sustain, what to do?
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> Relatively new small Essex grand.  When the sustain pedal is operated
> very slowly, it makes a moaning noise.  Removed the action, removed the
> pitman, and raised the tray by hand, heard the noise.  Here's what I
> think is causing it:  the lift tray is aluminum, the felt is soft and
> thick, and the tray pivot is nowhere near the underlever centers.  So
> when the tray is lifted, the underlevers slide on the felt, playing the
> aluminum tray like a violin.  What to do?  My inclination would be to
> replace the tray felt with something harder/smoother, and polish the
> undersides of all the underlevers with 400 grit sandpaper or finer.  But
> before going to all that trouble, I thought I would toss the question
> out to the list, and see if anyone else has encountered this, and what
> you did to fix it.  Any thoughts?
>
> thanks
>
> Mike Spalding
>
>