Soundboard repair

[Bigeartb@AOL.COM]

Gentlemen:
Rebuilding old grand piano. Question.....must repair three "cross grain" 
severe indentations in soundboard caused by three toggle bolts placed along a 
crack in soundboard . Will plug holes caused by the toggle bolt 
itself....will shim crack but will a mixture of epoxy and sawdust repair the 
"cross grain" indentations. If not, what are your suggestions. I am 
attempting to straighten up a mess made by what appears to be a 
"jack-legged"....'pianerrrr' tuner . Will epoxy stand up to the vibration of 
the board? Can it be sanded? The indentations are approx. 3/4" long and there 
are three of them. Would appreciate any suggestions. 

Thank you 
TommyBlack
Decatur, Ala.