[pianotech] Player Query

[John Ross]

I have a unit where the pumper bellows boards are delaminated.
The wood is 5/8", made up of  5/16"plus a smidgen, and two other  
pieces of wood equal in thickness, to make up the diameter.
Should I just glue them back together, or make new boards from 5/8"  
plywood, which would have more laminations?
If new is suggested, what grade should I use?
Thank you.
John Ross
Windsor, Nova Scotia, Canada