Thank you all for playing, and some were close. This is one of the
fascinating things about piano teching. So few moving parts in the una corda
mechanism, but so many things to go wrong.
>Shift is very sluggish and spongy. Immediately suspected cheekblocks and
>loosened screws to check.
>
>No effect.
>
>What was it?
...and the answer for this beasty was...
The shift lever pin/pedal lever pin/trap pin, even though held by a set
screw had wandered out until it was rubbing firmly against the lyre mounting
block.
Somehow the setscrew was loose enough to allow it to wander, but tight
enough that when you shifted the action it would either hold the thing in
the shifted position, or slowly _almost_ allow it to return. (there was lost
motion)
Loosened setscrew, pushed pin back in position and retightened setscrew. I
plan to install new screw and deburr pin to give it a better grip.
Conrad
Conrad Hoffsommer Office - (319) 387-1204
Luther College Music Dept Fax - (319) 387-1076
700 College Drive hoffsoco@luther.edu
Decorah, Iowa 52101-1045
Certified Calibration Technician (CCT) of
Digitally Activated Biopowered Tone Generation Systems
"If you have to plug it in, or you can't watch how it works,
I don't work on it."
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