Rob, I remember Dr. Sanderson talking about a one-third offset also, but it was regarding the difference in offset needed whether you strip-muted the entire piano or tuned all three strings as you go. More offset is needed on a pitch change if you tune the middle string throughout and then go back and do unisons as you would in a tuning. He recommended one-quarter offset when raising strings as you go, and one third for strip-muters. Personally, I think strip-muting for a pitch adjustment is a waste of time. Incidently, we usually get a lot of sharp pianos in soggy New Orleans this time of year, but because of "El-whatever" I was finding them all winter!!! We had a flash flood in November for God's sake!! I like using the SAT for a "lowering" rather than "topping" off the high spots because it maintains the stretch curve throughout the area and the adjustment varies according to the amount of sharpness. Then when you tune it, any new adjustments are small and uniform. Warren Rob Stuart-Vail wrote: > > Thanks, Paul..... > > That factor of 3 is something I got from Al Sanderson many years ago, and > it has worked well for me. > > Rob -- Warren D. Fisher fish@communique.net Registered Piano Technician Piano Technicians Guild New Orleans Chapter 701
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