<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <meta name=Generator content="Microsoft Word 12 (filtered medium)"> <style>  </style>  </head> <body bgcolor=white lang=FR-BE link=blue vlink=purple id="role_body"> <div class=Section1> Hi Terry.<o:p></o:p> <o:p> </o:p> Thanks for chiming in.<o:p></o:p> I think I will definitely use the cold liquid hide glue. There is only one try for the process, other than ordering a new board if I mess up this one.<o:p></o:p> <o:p> </o:p> I don’t know the data you ask about the board (I promise next time, which will be soon, I will ask this first). The board has been made by Ciresa in Italy, intended to be a close copy of the original, which was a 7’2” Bechstein piano board from 1873. They did ask me for specifications, but I told them to do their usual standard routine (I believed that they knew better than I, and still believe so at the time I write this). I will ask them how they proceeded.<o:p></o:p> From what I see on their website, they clamp the ribs on a curved surface. Am I right to suppose that in this case the ribs were shaped curve also ? With the same curve as the clamping surface ? If so, maybe they used the standard 60 ft radius ? As for the MC at ribbing, I don’t know, but I will look closely at the conditions when my board is flat again. I suppose it is a combination of rib and compression crowning. I’ll know more when they answer my inquiry. But if they indeed glued the curved ribs on a curved surface, then the MC at gluing time would be that when my board has the same curve as their hardware, not ?<o:p></o:p> Anyway, there is no advantage in drying more than when the board is just flat, if I get you well. So first I must do is bring the board back to flat.<o:p></o:p> <o:p> </o:p> How long do I have to do the board fitting in the piano before it swells again ? I suppose that any fitting done when the board changes dimensions again is of no value. Or is this overkill ? Relative humidity in my working environment is about 40 % at this time of year and global warming process.<o:p></o:p> <o:p> </o:p> Incredible how you can read tons about a subject, you only learn really when you put your hands on it.<o:p></o:p> <o:p> </o:p> Best regards,<o:p></o:p> And thanks again.<o:p></o:p> <o:p> </o:p> Stéphane Collin.<o:p></o:p> <o:p> </o:p> <div> Tell us more about the design and construction of this soundboard. Did you build it? Who built it? MC at ribbing? Radius on ribs? Radius on clamping cauls? Etc., etc.<o:p></o:p>  <o:p></o:p> Hope some of this helps.<o:p></o:p>  <o:p></o:p> Terry Farrell<o:p></o:p> Farrell Piano<o:p></o:p> </div> </div> </body> </html>