At 11:57 3/21/2005, you wrote: >Upright 1890 Kranich & Bach, in very good condition after much work, had a >treble hammer that bobbled a bit. > >Checked regulation points, all similar to its neighbors which worked fine. >Held the left pedal down a bit; didn't help. Tried the key with fewer >front rail punchings; no help. > >Realized the hammer wasn't checking at all. Tried adjusting backcheck; >hammer would not check in any position! Made double-sure backcheck was >aligned squarely to catcher and that felt and leather were good--same as >neighboring notes. > >Hmmm. > >Perfectly squaring and aligning the backcheck was what led to the proper >diagnosis (hint) but did not improve checking at all. Repair took a about >30 seconds and did not require turning any screws or any regulating. In >fact, I used no tools at all. Hammer now checks perfectly, wherever I want >to adjust it. > >Age of piano is a hint, although the problem had nothing to do with the >brand of the piano or it's action design which is very "modern," at least >as far as wippens, hammers, and butts go (but don't get me started on it's >rocker capstans and short, secondary stickers that are attached with >screws to the capstans). The point is, this problem could occur in ANY >upright but is more likely in an old one. > >No purchase required to enter. > >Alan R. Barnard >Sendin' Out Stumpers From Salem, MO > Glazed backstop and check. Used nail file to rough up surfaces? c
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