[pianotech] graphite and center pins?

[Ryan Sowers]

I spoke with Phil Glen about this when he worked for Young Chang. He said
the problem was that they put too much felt in the shank which upon a period
of use would start to expand and grab the pin. He recommended reaming and
repinning as a permanent fix. By removing the extra felt you can get a
stable result.

 Interestingly it is almost always the notes that are played the most that
seize up first - which is counter-intuitive to some piano owners who think
that pianos are stiff when new and then loosen up as they get "broken in".

On Wed, Apr 1, 2009 at 6:33 AM, Joe And Penny Goss <imatunr at srvinet.com>wrote:

>  Hi Jim.
> Valid point, but why then should we not bush all the bushings at the same
> time so that they are equal?
> For me the answer to your question only can be answered by observation of
> the results that can take years.
> So far it has been 5 years for one piano I service that exhibited this
> pinning problem with no further issues.
>
> Joe Goss RPT
> Mother Goose Tools
> imatunr at srvinet.com
> www.mothergoosetools.com
>
> ----- Original Message -----
> *From:* jim ialeggio <jimialeggio at gmail.com>
> *To:* pianotech at ptg.org
> *Sent:* Wednesday, April 01, 2009 5:15 AM
> *Subject:* [pianotech] graphite and center pins?
>
> A current thread mentions repinning as the solution to sluggish or sticking
> centers which have the tell-tale black spot indicating applied graphite.
>
> I don't understand how this would be a long term solution. Yes, the pin has
> been changed, maybe some felt has been removed with a broach, but the crud
> is still in the bushing.
>
> My interest here regards a long term rather than a triage fix.
>
> Jim
>
>
> --
> grandpianosolutions.com
> Shirley, MA  (978) 425-9026
>
>


-- 
Ryan Sowers, RPT
Puget Sound Chapter
Olympia, WA
www.pianova.net
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