What am I looking for in a 1923 "M" restoration bearing/crown, and how to measure, please?

[gordon stelter]

Greetings, Everybody!

     I'm restoring the ONE decent piano I've had a 
chance to  refurbish since moving here 20 years ago: a
1923 Steinway "M". Pretty good shape. 3 thin cracks in
 board. ( Intending to shim-a-la- Spurlock ) 
A little bearing on both sides of the bridge, all
along ( in a  humid room ) and between 1/16 and 1/8
crown along longest rib,in a  moderately humid room.
Crown on treble negligible. "Sustain" test was not
feasible, due to condition of action.  It is now in my
shop, at 42% RH ( or whatever would be best for
testing---I have full humidity control in  )  and I'm
wondering what would be acceptable pre-load bearing
and crown to look for in this thing, and how best to
check it ???  The customer does not want to install a
new board (yet), but everything else is being done "to
the nines" ( Whatever that means. ) I'd like to, as
accurately as possible, estimate the potential of this
thing, so I can tell him in advance about what to
expect. 
    Someone, please, with more experirence with this
make and model,tell me what parameters would be
satisfactory, and how to best measure them.

    !!! Thanks !!!
          G
  

P.S. Unless someone knows otherwise, I believe "to the
nines" may be a "hipster" permutation of "the whole
nine yards", the amount of cloth needed to make monks'
robes.  "Going the "whole nine yards" "  meant "fully
committed", as in when one leaves "the world" to join
a monastery.

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