Chickering (Wurlitzer) Buzzing Problem (resubmitted)

[sdpianotech at itctel.com]

Greetings, List.

I'm still stumped.  I sent this message to the list last week but far  
more interesting topics have been on the minds of list members so it's  
understandable my question has been put aside for other topics.  But I  
am still needing to solve the problem.  I'm hoping for some suggestions.

  The piano is about 12 years old and in good shape except that C#5 and a few
surrounding notes create a strong buzz which I located in the top end  
of the bass bridge.
  My early suspicions were loose screw/button on back of soundboard  
and/or loose
bridge/apron glue joint on front of soundboard.  Later thoughts  
include delamination of
plies in soundboard near end of bridge.  The buzzing stops if I apply  
pressure to the
bridge, the tiny overhang of apron sticking out beyond the end of the  
top end of the
bridge, or to the soundboard area just above the bridge.

My repair attempts were to tighten screw on the back of the soundboard  
attaching the
bridge (had to drill through back post to get to it) and work CA glue into
bridge/apron/soundboard joints on the front.  None of this worked.  I  
did my usual
seating of strings and bridge pins with no noticeable improvement.

Any thoughts/ideas/suggestions?  This piano is played a lot by an  
accomplished church
musician and the buzzing has got to go.

Thanks to all for any help.

Stuart Davidson
South Dakota, USA