On Tue, Aug 18, 2009 at 9:07 AM, Britney Kirk <bkirk at summerhaysmusic.com>wrote: > What causes a hammer to double-strike on an upright? When I play the > key, it feels like there is an extra force at the beginning of the > keystroke. When the keystroke is at the halfway point, the hammer has > already hit the string and started to come back. When I have finished my > keystroke, the hammer has returned and hit the string once more. > > > > I have tried re-pinning the hammer flange and doing a finer regulation. > The only thing that seems to help-- but not actually solving the problem, > and creating other problems-- is setting let-off extremely far from the > string. > > > > > > Any ideas? > Assuming the regulation is correct and the dip isn't too shallow or the blow distance too long and the hammer check is at 10.5mm or therabouts. 2 things come to mind, early damper lift and spongy or soft hammer return springs. Mike -- I intend to live forever. So far, so good. Steven Wright Michael Magness Magness Piano Service 608-786-4404 www.IFixPianos.com email mike at ifixpianos.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20090818/d5aaf266/attachment.htm>
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