Instructive Little Puzzler

[Tom Servinsky]

Instructive Little PuzzlerJust had a similar issue the other day. Turns out that the surface and angle of the hammerbutt had developed quite a  hash ridge, thus the jack wasn't able to return back to it's rest position.
Correction: remove hammerbutt and press the leather/felt configuration back to a smoother surface. Problem solved.
Tom Servinsky
  ----- Original Message ----- 
  From: Alan Barnard 
  To: pianotech at ptg.org 
  Sent: Saturday, August 25, 2007 1:50 PM
  Subject: Instructive Little Puzzler


  Problem:  Acrosonic with a key that just occasionally sticks after a hardish blow. And when it sticks, it really sticks.


  Diagnostics:  Keystick NOT sticking. NO foreign objects or parts interference. Jack and jack spring working just swell, thank you. NOT a pinning problem with any flange. Damper working correctly, spoon NOT corroded and NOT digging into the felt. Hammer and butt in good condition and traveling correctly. Lost motion, letoff, and aftertouch (on a spinet?) nicely regulated, after some adjustments by yours truly.


  Hint: Had to remove the @*&#$% action and practically use my xray vision to spot the problem. Actual fix took about 15 seconds and required a tiny drop of PVC-E glue.


  Alan Barnard
  Salem, MO

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