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Hello Roy,
This is standard on most K&B grands. This
bolt/screw is made to fit a tuning hammer. The
action does not shift, instead the hammer line raises
when the soft pedal is engaged. You will find also that
these actions looks different from most. Don't let this
scare you.
It is my guess that this bolt/screw was an attempt
to discourage people from repairing their own pianos.
Old piano guy!
Jack
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