That may be the case, but thats exactly what Steinway Hamburg does. They take the ribbed assembly and put it in a hotbox to dry it out before attaching the bridge and glueing the whole thing into the rim. Which bit they did first I dont clearly remember... but seems to me if memory serves me right this was about getting the bridges on the panel for in some fashion they weren't inclined to elaborate on. Cheers RicB "There is absolutely no need to dry out the soundboard (and ribs!) once the thing is made, and I presume it could be pretty harmful, though a lot less harmful than drying it out after it's stuck in"
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