[pianotech] Field hammer shank replacement

[Les Koltvedt]

The collar is really just a fillet and gives the shank strength.  It's the same 
principle that's applied to race car frames when the tubing is brazed together. 
  


Date: Sat, 11 Sep 2010 15:34:03 -0500
From: paul bruesch <paul at bruesch.net>
To: pianotech at ptg.org
Subject: Re: [pianotech] Field hammer shank replacement
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    <AANLkTikhpfmadpniSm2p3g7NVvM4OX1zPKp4RZUpEFMi at mail.gmail.com>
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After some lack of success, I recently recalled a detail that Randy Potter
teaches about the drywall screw method... apply heat to the screw until the
butt starts to feel quite warm.

And as Gregor mentions, I have found it very helpful to cut and scrape off
the glue collar before using any extraction method. In my (limited)
experience, it seems that the glue collar plays a pretty significant role in
the strength of the bond.

Paul Bruesch
Stillwater, MN



      
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