Don wrote: >> Hammer center friction that is too low can contribute to bobbling at times, and if the above spring and damper regulation doesn't fix the problem, one can pick an especially bad bobbling note, pull the hammer, and see if the friction is close to zero. If so, pin it for 4 grams friction or so (measured at the flange screw hole) and try it again. If that fixes the problem, you have the solution. This could be the relation to dryness! Perhaps a loose screw makes the friction of the hammer center too low. I don´t know the English term, the German word is "Plättchenschraube". That metal part that connects the hammer butt with its flange (disk? pad? shim?) is screwed with a screw. Perhaps that screw is too loose due to dryness? Gregor Gregor, Great suggestions. The nomenclature here for "Plättchenschraube". is plate. Now isn't that easier to spell? <G> Best wishes, Tom Driscoll -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090125/ecce135a/attachment-0001.html>
This PTG archive page provided courtesy of Moy Piano Service, LLC