Yes... both bits in equal proportion. One thing that goes again and again tho... not submiting a piano to extremes of climate conditions. Strikes me that if you hold any board within reasonable operating parameters climate wise it will last a long time and do very well indeed. But we digress.... I get your drift anyways. You are willing to go so far as to acknowledge that if the end grain in Rons experiment can be attributed as the reason the panel didn't crown, then it must be strong enough to resist any such pressure.... which immediately means it would be able to hold up in the arch scenario. But you are not willing to go along with it ever being in the arch scenario to begin with.... yes ? " I agree, that if one believes that rim constraint causes crown, then a panel edge that resisted crushing would indeed be part of a crown-making system." Cheers RicB > But it is kinda cool to try and understand how all > these different ways of going about building a piano are reasoned out... > and how much of that reasoning has something going for it. And how much of it for which there is no reason....... Terry Farrell
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