Hi all,  A friend of mine bought a 1930 Chickering "A" and I'm helping
him to restore it.  The piano was in untouched condition and all the
tubing basically shattered it was so brittle.

What is baffling me is a small pneumatic on the expression mechanism,
about 3/4" square.  (The piano is at his house, I'm working from memory
here!)  It's on the bottom of one of the two pneumatics (I believe,
again, it's the spring pneumatic), and it works against it when closed.

Can anyone confirm where to where I connect the input to this
pneumatic?  The tubing is missing unfortunately.

Regards,

Eliyahu Shahar

 [ I asked Bob Taylor about this.  He says the pneumatics reduce the
 [ stack suction slightly when the loud pedal is on.  Dean Randall
 [ wrote in 020710 MMDigest that Ampico called them "loud pedal
 [ compensators".  See "Ampico Sustain Pedal Compensating Pneumatics",
 [ indexed at http://mmd.foxtail.com/Archives/KWIC/C/compensating.html
 [ -- Robbie