Reply To: Grand Piano Repair Question
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Others might have a better idea than this, but I would approach it like this.
Make a copy of the piece, at least the area where the holes are, and replicate in it the holes from the original to the precision you need.
Then I would fill the original piece with a mixture of epoxy and sawdust.
Once dry and sanded I would use the copy as a template to replicate the holes precisely in the now filled original piece.
Good luck!
Darren.