Gluing sound board cracks back to ribs.

[Richard Moody]

The problem is a cracked soundboard, and one side of the crack has
pulled away from the rib about as far as to slip a business card
through if it were cut in half.    This is in a full sized upright,
player piano actually.  I must make any repair from the rib side.  
 
	The repair I am most familiar is drilling a pilot hole through the
rib and SB, then drilling a body hole through the rib, stopping the
bit with ground down hack saw blade, or old palette knife. Then
smearing glue into the crack with the thin blade and running the
screw in. 
	Schaff (new catalog) offers a "sound board toggle" p 82.    Do I
understand  these are left in the piano after the repair is
completed?  Or is there a way to remove them and fill the access
hole with a dowel? On p. 62 is a "soundboard repair clamp".  (wire,
locking nut and wingnut) But this looks like one must have access
to both sides of the soundboard.  Is this correct?   Both of these
appeal to me because it looks like they can draw the seperation
together with more strength than a screw through a 1/4 inch of
spruce.  
	If any one has used these repairs and can advise, I would be most
grateful.  Or perhaps there is something out there I am not aware
of.   I know of the repair in Reblitz using thin bolts and washers
but  that needs access to both sides which I do not have. On p.
128, illus. 7-14 is the exact problem I am facing. One side of the
crack has curled away, the other seems intact.  Should I screw down
the other side to be safe?  ---ric