Don wrote: > Hi all, > > I wonder if this is not similar to what happens when you wish to tighten a > hammer with a wooden shank. Even though there is lots of friction, tapping > the base of the handle works (and quite brilliantly). I also wonder if > there is a force to one direction on the duplex bars so that when oridinary > vibration of low frequency but large amplitude from a moving van allows > them to shift. Do they tend to go out of tune in the *same* direction? Or > has anyone noticed that happening. I cannot conceive of any circumstances under which the aliquot/duplex bars/pieces could move with the strings still in place and under tension. While there is friction between the string and the aliquot/duplex bar/piece, it is far less than the friction that exists between the aliquot/duplex bar/piece and the plate. If the plate shifts during a move, of course, the aliquot/duplex bars/pieces will move right along with it. > I wonder too, that if after they were tuned a drop of thin CA glue (or > perhaps one of the anerobric glues) might not hold them in place, yet still > allow them to be moved later if necessary (a sharp tap would break the glue > bond) Since they don't move, this would have no effect other than to mess up the plate and/or string where the glue was placed. The so-called 'tuned aliquot' string segments don't get in tune because of string friction through the bridge pins and they wouldn't stay in tune because the position of the soundboard is a moving target. The whole issue is moot anyway since -- as long as the lengths are long enough to not overly impede the motion of the soundboard -- tuning the back scale has no practical effect on the performance of the piano. Del
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