Hello Paul,
This is indeed a " Lost Motion Eliminator "
This device allows a "soft " pedal to raise the
hammers closer to the strings without creating
any lost motion between the keys to the hammer.
This small lever was activated by a control rod
at the back connected to a pedal and could be
individually regulated
Melville Clark first used this system in his
" Apollo " player Grands.
The connection between the Chickering Bros.
" Acoustigrande" and the " A. B. Chase " could
have been the Thayer Action Co.
They are the Co. that built this particular
whippen.
Hope this helps,
Jack Wyatt
**************Biggest Grammy Award surprises of all time on AOL Music.
(http://music.aol.com/grammys/pictures/never-won-a-grammy?NCID=aolcmp003000000025
48)
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