Yep, I agree too. It just hasn't been necessary in my experience, to weaken damper springs to fix double striking hammers and the dealer wasn't interested in paying for such things anyway. ROn N Initially I did this on a mass installation of Yams. P2s and Kawais ust-7s and some prambergers at a college near Napa,Ca. The touch on all of them was ridiculously heavy. Changing the damper spring tension transformed the touch in a beautiful way. Made em very fluid Dale E. Dale Erwin R.P.T. Erwin's Piano Restoration Inc. Mason & Hamlin/Steinway/U.S. pianos www.Erwinspiano.com Phone: 209-577-8397 *Subject:* Re: [pianotech] Yamaha Uprights > > My observation is that a damper spring, upright or grand, only needs > enough tension/pressure to insure shut-off. Beyond that we aren't > depending on it to adjust touch weight. The damper resistance should > be minimal. > > *Dale Erwin R.P.T. **/ /*---- Yep, I agree too. It just hasn't been necessary in my experience, to weaken damper springs to fix double striking hammers and the dealer wasn't interested in paying for such things anyway. It does occur to me that there is one change I typically made. New Yamaha verticals always came with the capstans high and the hammer shanks floating uniformly above the rest rail. I'd shim the rail up to get minimal lost motion, so I could pull the shims a few years later and just have to do the capstan adjustments once. That would have introduced very slightly more lost motion and might well have made a difference. Ron N -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20121202/a8f3601c/attachment.htm>
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