[pianotech] Lowering the stack on a Steinway

[David Love]

Encountered a Steinway c1960's today. Had been converted from Teflon to
Renner action.  Overall, the stack is too high.  Center pin to key bed is 
5 7/8"+.  Shanks are on the rest cushions with just about exactly 1 3/4"
blow.  Shanks can rebound into the balancier screw with certain types of
staccato touch.  Capstans are screw up far too high.  Looking for an
efficient way to cut down the key frame rests for the stack feet and lower
the stack by about 1/8"+.  Any suggestions?  

There are other issues with this action as well that I will need to address.
Leverage is very high.  Original shank swapped out to 16.5 knuckle hanging.
Wippen assist springs were employed and in the upper part of the piano the
hammer tails contact the assist springs on a hard blow.  Hammers are too
heavy even with the assist spring for this action (have yet to do a complete
analysis).  However, the stack, I'm convinced, must be lowered no matter
what.  

David Love
www.davidlovepianos.com