Presently working on a 1918 model O. It’s soundboard has a series of cracks running along both bridges – esp. the treble. Close inspection revealed rib separation from the s. board at various points which were epoxyed and clamped. Fortunately most of these cracks are under the plate, so the area w/decal can be left alone.
Client wasn’t open to installing a new soundboard, and the orig., still has decent bearing & crown. The piano had been re-pinned and strung at some point; a variety of pin sizes were used – #4 and #5 down in the bass, even. Will replace pinblock with a 5 ply Bolduc. Both bridges are in good shape w/o cracks, they will be scraped and refinished.