Hi Geoff, The biggest single factor for instability is the metal plate flexing possibly in the hitch pin area. There are many factors that contribute as well but I believe the sum of their effects is less than plate flex. I over pull even on a 2 cent change at A4. If it is for a concert "do it twice" comes into play almost immediately. Terry's statement about "excessive" pin movement is a bit misleading. It is the change in tension that creates the instability. At 09:18 PM 12/20/2005 -0800, you wrote: >Am I correct that it is not the "excessive" pin movement that directly >precipitates the instability but the need of the soundboard to adjust to the >change in tension, whether from tuning or changes in humidity, that makes >for instability? Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T. Non calor sed umor est qui nobis incommodat mailto:pianotuna@yahoo.com http://us.geocities.com/drpt1948/ 3004 Grant Rd. REGINA, SK, S4S 5G7 306-539-0716 or 1-888-29t-uner
This PTG archive page provided courtesy of Moy Piano Service, LLC