Instructive Challenge of the Day

[Alan]

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Upright 1890 Kranich & Bach, in very good condition after much work, had =
a
treble hammer that bobbled a bit.=20
=20
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.=20
=20
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.
=20
Hmmm.
=20
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.
=20
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.
=20
No purchase required to enter.=20
=20
Alan R. Barnard
Sendin' Out Stumpers From Salem, MO
=20

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