damper mechanism squeaks....argh!

[ed440 at mindspring.com]

Check to see if there is a very slight bow or curve in the pedal rod.  If so, switch it for the sostenuto rod.  Also make sure the pedal rod guide bushing is lubed and doesn't have a glue spot rubbing the rod.

Ed Sutton

 
>----- Original Message ----- 
>From: <piannaman at aol.com>
>To: <pianotech at ptg.org>
>Sent: Thursday, December 21, 2006 9:16 AM
>Subject: damper mechanism squeaks....argh!
>
>
>Hi All,
>
>I thought I could solve any damper pedal mechanism squeak, and up until 
>recently, I've had pretty good luck.  Then I met a recent model Hallet-Davis 
>(Dongbei built, I believe) upright.
>
>I lubricated and tightened everything I could think of.  Here's the list of 
>things I tightened and lubed:
>
>Lubed
>damper flange centers (protek CLP)
>damper springs (teflon powder)
>damper lever felt with teflon(two weeks prior) and protek last night
>lift rod with protek
>all rod tips and linkage w/ special blend
>
>tightened
>all screws on the various rails
>pedal rod hinge screws
>all pedal brackets and fixture screws
>all damper flange screws
>all available case screws
>In addition, I inserted buckskin pieces in places where case parts were 
>rubbing and replaced the rubber pieces where the pedal rod inserts into the 
>lift rod with buckskin pieces
>
>Noise still there…..argh! It sounds to me like it's the damper lever 
>felt/lift rod interface. It doesn't happen when the pedal is first being 
>used, say for 20-30 presses of the pedal. Then gradually, the creak comes 
>back.
>
>I don't know what else to do. Did I miss anything?  Any ideas?
>
>Dave Stahl
>
>Dave Stahl Piano Service
>650-224-3560
>dstahlpiano at sbcglobal.net
>http://dstahlpiano.net/
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