Laws of physics in reverse?

[Dave McKibben]

Try a lock nut system.
After you adjust the pedal, run another nut down on top of the " adjusting
nut " and lock it in place ( nut tight against the other ) .
I would be suprised if it moved under that scenario.

Dave McKibben

> [Original Message]
> From: Arlie Rauch <adarpub at midrivers.com>
> To: <pianotech at ptg.org>
> Date: 3/25/2006 3:35:40 PM
> Subject: Laws of physics in reverse?
>
> A customer called me the other day who has an old upright piano, a  
> fairly nice one.  But it has one unusual feature--either that or she  
> is not telling me everything.  The nut which adjusts the damper pedal  
> tightens itself over time to the degree that the dampers stand off  
> from the strings, and the sound just rings.
>
> Is this really possible?  She claims no one tampers with it.  But  
> every visit I adjust it so it works properly, and my next visit it is  
> screwed down so tight that the dampers are off the strings again.
>
> Anyone else experience this?  Can you explain it?  I can understand a  
> nut loosening, but tightening by itself baffles me.
>
> Anyway, it's time to loosen the nut again!
>
> Arlie Rauch
> Glendive, MT
>