[pianotech] X-Ratcheting Counter Bearing Shim

[David Love]

The other thing that Jon might consider is placing the half rounds on top of
the felt rather than on the plate behind the felt.  That would raise the
strings completely off the felt.  You might not need as tall a piece of
brass either.  While prying the wire up might be difficult it's not such a
long section that letting down the tension would be burdensome in order to
facilitate inserting the half rounds.  

Good to hear from you Mr. Overs.  It's amazing how proper lighting can
smooth out those little blemishes.  <G>

David Love
www.davidlovepianos.com


-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Ron Overs
Sent: Sunday, April 11, 2010 7:06 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] X-Ratcheting Counter Bearing Shim

David and all,

We change the counterbearing arrangement 
similarly. I also regard it as important to have 
enough free string length segment on the 
tuning-pin side of the agraffe - 20 mm works out 
to be about the optimum (we have done tests 
in-house to establish this). Certainly, those 
pianos from makers who insist on running the 
counterbearing felt very close to the agraffe, 
tend not to speak quite as well as they otherwise 
would.

Good to see that nicely prepared plate, David.

Ron O.

>I've produced this method of counterbearing and tried inserting felt
between
>the agraffes as well as not.  There doesn't seem to be any ringing if the
>felt is not inserted between the counterbearing bar and the agraffe.  I do
>insert felt on the tuning pin side even though that doesn't seem to produce
>much ringing either.  Lately, however, I tend to insert felt on both sides
>of the counterbearing bar more for looks than anything else.  It's pretty
>soft felt though and doesn't apply much if any real pressure on the
strings.
>
>
>David Love
>www.davidlovepianos.com
>
>
>I like it, I have not had a lot of luck with protek on the understring
felt.
>You do need to have contact with the felt though or you have some ringing?
>
>David Ilvedson, RPT
>Pacifica, CA  94044
>
>
>Attachment converted: Powerbk HD:P3210060.jpg (JPEG/<IC>) (00CE4E46)


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OVERS PIANOS - SYDNEY
    Grand Piano Manufacturers
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