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<p class=MsoNormal><span style='color:#215868'>Repetition lever set too low.
What you did was the way to check the repetition lever height. Old timers call
that “rolling the flies”. If you trip the jack and you just <i>barely</i> feel
the top of the jack scrape the knuckle but it does return fully on its own, the
rep height is correct. The tightness of the jack bushings is another matter.
They should be pretty free.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#215868'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#215868'>dp<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#215868'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#215868'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#215868'>David M. Porritt, RPT<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#215868'><a href="mailto:dporritt@smu.edu"><span style='color:blue'>dporritt@smu.edu</span></a><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#215868'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] <b>On Behalf Of </b>Matthew
Todd<br>
<b>Sent:</b> Sunday, August 17, 2008 5:41 PM<br>
<b>To:</b> pianotech@ptg.org<br>
<b>Subject:</b> Grand Jacks<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>I have been observing a grand action, and I was curious
about something (is that a surprise??)<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>A) I went and tripped each jack toe and I noticed that
some of them when I tripped the jack toe down, and then released it, the toe
immediately went back up. B) On others, I tripped the jack toe, and
when I released it, the toe went up, but not fully, and I would gently push the
toe and would feel the "click" of the toe returning to it's
position. C) And yet, on a few others, when I pushed down the jack
toe, and then released it, the toe would stay down (assuming a tight flange
here).<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>What should be the consistency with each note? I'm
assuming, after I trip the jack toe and release it, the jack should return
fully to where it began. What other problems can there be besides
tight flanges to have the jack not return fully?<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>Thanks,<o:p></o:p></p>
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<p class=MsoNormal>Matthew<o:p></o:p></p>
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