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<DIV>Well here’s the image I promised y’all. The problem was the damper
tray would not fall on it’s own away from the underlevers when even the
slightest of hindrance was present after installing the PianoDisc player
system. The result initially was the bass dampers were leaking (singing,
ciphering). I readjusted almost the entire bass section and the result was
the problem moved to the top quarter of all the dampers then leaked.
Rather than chase each leaky damper only to have new ones show up, and to
prevent the eventual and occasional leaker show up as damper felts compress with
time, I considered many other alternatives the least desirable being a total
redesign of my pedal mechanism cross over, pedal solenoid placement and pedal
push rod interface. A time effective, cost effective and viable fix
was to increase the downward weight of the damper tray. Some piano
manufacturers have used a damper tray return spring as part of their usual
production run.</DIV>
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<DIV>My previous post indicated the lack of return even though the pitman was
removed. I tried lubing the damper tray pivots and felt there was no
change which led me to believe the underlever flanges were sluggish. (the
piano sat in storage for a while) For the damper tray to drop away from the
underlevers once the damper felts are resting on the strings, all of the
underlever flanges must move. Additive friction is creating my problem
along with the usual friction points associated with the entire pedal assembly
and it’s design. I could have lubed all the underlever flanges but that
fix has historically been temporary ... not that I’ve experienced that
with Protech CLP which is what I considered using however, I didn’t go that
route. I could have repinned all the underlever flanges but that requires
lots of time. All of these methods mentioned added together would have
taken me two days to complete.</DIV>
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<DIV>I opted to install a very simple fix that cured all ills and when weighed
against all the parameters involved with this job, I felt it was the best
choice. Mind you I’m not responsible for the condition of the piano when
it arrives. A dealer appreciates a cost effective and reliable job.
As long as the customer is happy with the results there’s no need to impose any
additional expense on all involved. I feel the true art of our trade is to
master this balance with knowledge and ingenuity.</DIV>
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<DIV><IMG
style="BACKGROUND-IMAGE: none; BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; DISPLAY: inline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px"
title=2013-02-17_11-59-12_399 border=0 alt=2013-02-17_11-59-12_399
src="cid:6D874B5829CC46B4B65D4F3E723E2B54@LarryPC" width=644 height=365></DIV>
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<DIV>I wound 22 gauge piano wire around a half inch dowel pinching the wire and
the dowel in the jaws of the vise. I then made two rounds and cut it off
with plenty to spare at each end. I then made the trip to the dealer’s
floor and drilled two holes just big enough to accommodate the wire and about an
inch (25 mm) deep or better. The final fitting was done on site including
the right angle bend where the wire goes into the damper tray. To make the
wire even tighter in the pivot block hole, I put a few small bends in the wire
distorting it slightly. The other end has to rotate slightly in the hole
so I left it free to move. The inherent shape of the spring coupled
together with the force it creates keeps the wire in position and therefore no
glue was used. Using a very slow release to reduce the effects of inertia,
I adjusted the spring until the damper tray followed the rest of the mechanism
away from the underlevers and then I made it just a hair stronger. This
adjustment was made just outside of the pivot block. You can see the wire
bend just outside of the block in this image.</DIV>
<DIV> </DIV>
<DIV>Considering the zillions of times this tray moves, I included the loops to
spread out the fatiguing effects over a larger portion of the wire. The
loops also absorb the discrepancy between the two different radii of the damper
tray pivot and the spring. </DIV>
<DIV> </DIV>
<DIV>I was in and out in about an hour, the dealer was happy, and I had ample
time to join a pretty pair of blue eyes for lunch. She’s a good low fat
cook. Hmmmm.</DIV></DIV></DIV></BODY></HTML>