MH BB Pinblock

[A440A at aol.com]

 David writes:

<< pinblock is screwed to the inner rim via a couple of plate screws that
penetrate the block down to the rim) all the way to the stretcher why would
you need to attach the pinblock to the stretcher to create case stability.   
>>

I don't think it is a question of case stability, but rather, stiffness in 
the plate/block assembly.  
    The attachment of the block to the stretcher assists the block in 
resisting  movment of the strings in the vertical plane.  These vibrations are quite 
small, but I consider them important, and without some vertical component to 
the "beam" that resists them, more energy is lost to heat than otherwise would 
be.   
   It could be that the increased stiffness afforded by attaching the block 
to the stretcher would also increase the entrainment of the strings' vibration 
to the case.  
Regards,
 
Ed Foote RPT 
http://www.uk-piano.org/edfoote/index.html
www.uk-piano.org/edfoote/well_tempered_piano.html
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