[pianotech] key bushing problem

David Love davidlovepianos at comcast.net
Tue Jan 26 20:52:41 MST 2010


You're sure you used the final caul and not the intermediate caul at the
end?  Otherwise, I'm not sure what could happened.  The trial method you
state is the one that works for me. 

 

David Love

www.davidlovepianos.com

 

On Tue, Jan 26, 2010 at 8:08 PM, David Nereson <da88ve at gmail.com> wrote:

  I rebushed a set of keys using the nylon Spurlock cauls. The pins were
.146" so I used that size caul.  When done, the keys still wobbled laterally
(balance rail).  This has happened a couple times now.  I had done no easing
or ironing after removing the cauls.  Should I have used a smaller caul
(even tho' the size I used is meant for that size pin) or thicker bushing
cloth?  Or both?  When I initially determined what thickness cloth to use,
by laying the trial cloth across the mortise and pushing a key pin into the
hole, thick seemed way too tight.  Medium was just right (could be pushed
in, but holding the key upside down, the pin would not fall out -- this is
according to the Spurlock directions).
  Once I steamed 'em all back out and rebushed with thicker cloth, but using
the same cauls, and they still came out too loose (too much lateral play).
So do you use a smaller caul than the one intended for a given size pin?
  --David Nereson, RPT 

 

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