[pianotech] sostenuto

[Tom Driscoll]

Ed,
   I've had my share of sostenuto problems and they usually begin with inconsistant positioning of the tabs on the damper levers. They have to be in a straight line as viewed fron the front and as viewed from the top. Keydip has to reasonably consistant so the tabs will be in line when the key is depressed. Until the damper-key regulation is uniform it is difficult to position the rod to make it all work. 
    I know this is only a partial answer to the problem . 
Best wishes ,
 Tom D.


----- Original Message ----- 
  From: Ed Carwithen 
  To: Piano Tech List 
  Cc: edwcarw at yahoo.com 
  Sent: Tuesday, July 20, 2010 8:48 PM
  Subject: [pianotech] sostenuto


        I need help getting the adjustment right on the sostenuto mechanism of a 1918 Sohmer 9 foot grand.

        This is a piano that I have been servicing for several years but one section of dampers has always been a problem.  I knew that I would have to repin the under lever flanges some time and this past week was the time.  

        In order to get to the under lever flange screws I had to unhook the sostenuto rod.  I got the flanges repinned and back and they work fine, but now I can't get the sostenuto regulated.  I have fiddled with it (and fiddled with it; and fiddled with it) but just can not get the tolerance correct.

        Any suggestions from the collected wisdom of this website would be greatly appreciated.

        HELP!!!!

        Ed Carwithen
        John Day, OR 

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