Hello Tom.
The action you describe sounds like the one
developed by the Thayer Action Co. for M. Schultz.
If so the spring you describe will make a half
circle. One end will hook to a round shank glued
into the main whippen lever.
Such an action model is in the PTG Museum.
Also one by W. P. Haines that is similar except
it has an adjustable but weird spring that is
supposed to act as repetition lever
To regulate this action is the same as an upright
with the shank resting on the hammer rail.
As a side note, Ludwig built a Grand piano
with the main cabinet made of concrete. Please
check this case I would like to have this Ser. No.
Regards to all,
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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