Hello,
I'm new to PTC and read with interest your temporary setup for repairing a soundboard. Can I assume the ribs have detached from the spruce board or there are serious cracks in the board? I have a Gordon Laughead (furniture store/mail order piano from the 60s) that has detached ribs that have been reglued by previous techs in an attempt to reconnect the ribs to the board to prevent vibrations in the C3 range. What have your discovered to date? Thanks for your photo. I give me some ideas. Roger from Northern VA