string rendering (was: soft blows)

[Piano Forte Supply]

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Is it really only the increased string tension of a hard blow that 
"pulls" the string across the bearing bridge?  What about the vibration 
of the string and bridge helping to overcome the friction at the bearing 
points, similar to a heavy object on a sloped table starting to "slide" 
when it or the table vibrates?

> But not knowing what the tension differential between the speaking 
> length (and beyond) and the rear duplex (and beyond), the information 
> is pretty much useless for determining whether a hard blow will pull a 
> string through the bridge pins.
>
> Ron N


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