Hi Cy, I have no idea how the bridge moves. Ron's numbers may indicate that it does somehow. I've often notice patterns of unison smudging that show one string of a unison moving much more than another. I guess the causes could be non parrallel notching--or the bridge rotating in the horizontal plane--or rotating in the vertical plane or a combination of all three. Strings also are observed to climb the pins. It is postulated that this is caused by the bridge getting thicker. I wonder if anyone has checked for climbing on DC controlled uprights? (I have not). The solution is good humidity control. At 07:23 AM 6/8/2007 -0600, you wrote: > >Don, > >I'm having trouble visualizing the change of dimension of a cross-laminated >pinblock with humidity. Do you think the change in the horizontal plane is >the significant factor? Does it get thicker, too? If it gets larger in >every dimension, like a dry sponge, then the pins farther from the plate >flange should move away from the hitch pin more than the close pins do. > >--Cy-- Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T. Non calor sed umor est qui nobis incommodat mailto:pianotuna at yahoo.com http://us.geocities.com/drpt1948/ 3004 Grant Rd. REGINA, SK, S4S 5G7 306-539-0716 or 1-888-29t-uner
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