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<p class=MsoNormal><font size=2 color=navy face=Arial><span =
style='font-size:
10.0pt;font-family:Arial;color:navy'>A very simple approach that I found =
works
well is to first ease balance rail hole (not the bushing) so that the =
key
slides slowly down the pin, and the front bushing to have just the =
slightest
movement at the bottom of the key when moved from side to side. <span
style='mso-spacerun:yes'> </span>Do this after polishing and =
lubricating
the key pins.<span style='mso-spacerun:yes'> </span>Then install =
the keys
without the stack.<span style='mso-spacerun:yes'> </span>From =
your gram
weight set, get a 30 and a 26 (or a 50 and a 46, or a 20 and a 16), two =
weights
that are four grams apart and will represent 2 grams worth of friction =
when <span
class=SpellE>downweight</span> and <span =
class=SpellE>upweight</span> are
achieved using these two (f = (d-u)/2.<span =
style='mso-spacerun:yes'>
</span>Set the 30g weight on the front of the key and using a couple of =
jiffy
leads move them around on the key until the key just goes down.<span
style='mso-spacerun:yes'> </span>Take the 30 g weight off and =
replace it
with the 26g weight.<span style='mso-spacerun:yes'> </span>If =
the key
doesn’t go up, ease slightly at the balance rail bushing and check =
again—since
that’s the only likely remaining variable and the hardest one to =
see
movement and free play on.<span style='mso-spacerun:yes'> =
</span><span
style='mso-spacerun:yes'> </span>You can get a sense of how much
additional friction over the 2 grams exists by sliding the 26g weight =
back
toward the balance rail until the key rises.<span
style='mso-spacerun:yes'> </span><o:p></o:p></span></font></p>
<div>
<p><font size=2 color=navy face="Times New Roman"><span =
style='font-size:10.0pt;
color:navy;mso-no-proof:yes'>David Love<br>
davidlovepianos@comcast.net </span></font><o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 =
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style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 =
face=Arial><span
style='font-size:10.0pt;font-family:Arial'>> Actually... Terry =
turned me on
to this idea... you do it the same way as <br>
> you take balance weight... except the stack is off so there is =
nothing <br>
> on the keys. I like to put about 50 grams of weight on the =
back of
the <br>
> key and then just take up and downweight measurements.<br>
> <br>
> Cheers<br>
> RicB<br>
> <br>
> Barbara Richmond wrote:<br>
> <br>
> > Ric,<br>
> ><br>
> > I haven't gotten that far in my studies. How do you =
measure
that? <br>
> > I've just always adjusted keys the "old" way--by =
touch--how
the key <br>
> > slides down the balance pin and the fit of the bushings.<br>
> ><br>
> > Barbara Richmond<br>
> > (I wanna be a touchweight freak.)</span></font><o:p></o:p></p>
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