William - Two things come to mind. First, as you point out, range of up / down weights is bizarre, and warrants more attention. Do all the notes you try this staccato technique respond the same way? If not, what are the up and down weights for those that do and don't. Second, while you seem quite thorough, you didn't actually mention checking for keyframe bedding, primarily balance and back rail. Meanwhile, it's worth re-reading all the various conjectures, just to refresh your (my) memory of what's actually going on. Good luck. David Skolnik Hastings on Hudson, NY At 09:19 PM 7/29/2010, you wrote: >Hi List, > >Anyone know of anything chronic in Boston Grands (GP178) that has >the hammer double striking on a quick/firm staccato blow? I've got >one that does. Anyone have any ideas/solutions? The piano is >finely regulated otherwise (just today, in fact). 1 3/4" blow, >about .400" Key Travel, Checking about 1/2", Rep springs are >definitely NOT jumpy. In all other ways, the action plays nicely, >controllably. And that is no mean feat. I took some DW/UW measures >today out of curiousity, and they were haywire. DW range from 62g - >46g, UW from 18g to 35g or so. > >My thoughts are turning to action pinning (haven't checked >yet). Key Bushings and pins are clean and lubed (teflon), but >that's as far as we got. Wondering if tight pinning (of any parts) >might contribute to this rebounding back into the strings - and it >is a full rebound. You can watch the hammer appear to bounce off >the rest rail, though I'm not convinced that is exactly what is >happening. Kind of musing aloud here.............. >William R. Monroe
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