Ed Sutton wrote: > This is an interesting thread. > > I would point out that harpsichord and fortepiano pinblocks have a > tendency to belly downward in response to the tension on the tuning > pins. Old Bechstein pianos also have a characteristic break of the plate > strut at the block that indicates a similar flexing. > > It should not be that difficult, with an appropriate gauge, to measure > for downward deflection of the block after a pitch raise. No, it shouldn't, nor to measure soundboard movement, or overall linear changes between hitch and tuning pins with added tension. I see no reason to presume that pinblocks bellying downward would lower pitch either. Ron N
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