>The only way to tell for sure (that I know) is to examine the old ribs after >the old soundboard is removed. Measuring ribs in place may give some clues, >but would probably not be conclusive. > >Frank Weston Well, now I am confused. I thought you had another shop do soundboard work for you, or am I mistaken? I'm still wondering how you verified that none of those old Knabes had crowned ribs. Do you get the old board back with the piano when it returns from the rebuilder? Even with the old board at hand, what sort of evidence do you typically look for to determine what crowning system was used? Since any type of rib that has been subjected to bending forces of any kind for 50+ years will take a set, what do you look for that will conclusively tell you what the original top profile of the rib was? Please explain. This hasn't come up before, and I would really like to know how it's done. Ron N
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