Recrowning the soundboard,something different

[Wayne Hohle]

hi list
a recent chapter meeting our host explained that he improved sound board crown
by cutting through the  treble-tenor bridge, perhaps in two or three places, to
the soundboard. then he placed a heavy beam across the rim and with a
turniquiot[spelling?} pulled the sound board up to open up the cuts in the
bridge to a predetermind measurement. then he taped of the side of the bridge at
the cuts and filled them with west epoxy to dry overnight. the next day he would
remove all the stuff and go on to rebuild the piano.  he says the tone is nicely
improved.
any thoughts
wayne

p.s. is there really  20 tons of pressure on the soundboard or is that on the
frame and the pressure at downbearing at the bridge is something different