Orange Juice Can bzzzzz

[Terence Miller]

Dearest Liszt:
  
  New client with 6 mo old M&H model A, today was his 2nd tuning.
  
  Very clear 3 to 5 second resonance evident at G2-A2 a couple of notes  below the break. Resonated 3 octaves higher. Imagine an old-fashioned  metal orange juice can vibrating quickly.
  
  Couldn't voice it out. Present on all 6 strings. Not in the duplex or  front scale. No loose screws in the action or cavity. No change in bzzz  volume when I applied hand pressure to long and bass bridges or the  ribs or soundboard immediately below.
  
  Appears to be localized at or below the plate where the last wrapped  strings cross plain wire, down by the long bridge. Irritation is even  more prominent under the piano.
  
  Another client with an older A has similar symptoms. He has never been available to help me chase down the bzzz.
  
  
  I'm guessing that this is more design-related than string related. If  this is a gift of the longitudinal mode, then swapping stock strings  will probably have no impact.
  
  
  Anybody else experience this problem?
  
  Ideas?
  
  thanks
  
  Terry 
  
 
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