<div class="gmail_quote">On Fri, Mar 21, 2008 at 8:45 PM, Scott Jackson <<a href="mailto:scottwaynejackson@hotmail.com">scottwaynejackson@hotmail.com</a>> wrote:<br></div><div class="gmail_quote"><br></div><div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div bgcolor="#ffffff">
<div><font face="Arial" size="2">Yes! That's the number one problem that i've had
with Yamaha upright jacks. They can become "wedged" up between the hammer butt
and the set-off rail. I wasted a lot of time on this when i first encountered
it. I couldn't figure which direction to move the rail.</font></div><div></div></div></blockquote><div><br></div><div><div class="gmail_quote"><G></div><div class="gmail_quote"><br></div><div class="gmail_quote">
It's the <span class="Apple-style-span" style="font-style: italic; ">amount</span> of time I spent trying to diagnose that particular problem that has firmly ensconced it in my memory.</div><div class="gmail_quote"><br>
</div><div class="gmail_quote">Mine was a brand new Kawai vertical. I changed the regulation a couple times on one of the bad notes, measured friction on every part (there was a tight hammer center, but that didn't solve it). Finally called Kawai, and they suggested the jack binding on the letoff rail. It looked like it had enough clearance, too. I was, like Terry P., thinking the problem was in the plastic jack. Even tried some Teflon powder on the hammer butt. All to no avail, because the real problem was elsewhere.</div>
<div class="gmail_quote"><br></div><div class="gmail_quote">--<br></div><div class="gmail_quote">JF</div></div><div><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div bgcolor="#ffffff"><div><br></div>
<div><font face="Arial" size="2"></font></div>
<blockquote dir="ltr" style="padding-right:0px;padding-left:5px;margin-left:5px;border-left:#000000 2px solid;margin-right:0px">
<div style="font:10pt arial"> </div>
<div>... make sure the jack is not being forced into the letoff rail, and held
there when in check. At the end of the jack's arc, there should be a
minimum of 1mm clearance between the jack and the letoff rail felt. It
might <span style="font-style:italic"><span style="text-decoration:underline">look</span></span>
like there is enough clearance, so examine carefully. If there is not
enough clearance, you need to move the leftoff rail back to you slightly (away
from the strings). If you move the letoff rail, you'll need to reset
letoff.</div>
<div><br></div><font color="#888888">
<div>-- <br>JF</div></font></blockquote></div>
</blockquote></div><br>