Slick Key Bushings.

[Isaac OLEG SIMANOT]

Richard,

When the pianist play, we may not suppose that he always move his fingers
vertically, often the side of the bushing is dragging on the pin.

I've find useful to change the pins too, it limit play at the balance holes
and the effect is very sensible. Not too long job, but care of not oval the
holes, shim them if so.

Kluge sell the pins for Steinways (and nice felt bushings too).

Regards.

Isaac OLEG

> -----Message d'origine-----
> De : owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]De la part
> de Richard Broken
> Envoye : vendredi 5 avril 2002 14:42
> A : PTG; caut@ptg.org
> Objet : Slick Key Bushings.
>
>
> Hi list.
>
> Newton is always on about the need to polish key pins, and I have a
> story to relate that underlines the importance of as slick as possible a
> relationship between key pin and bushings.
>
> The other day one of the professors at the UiB came up and complained
> about the friction of the keys on the two S&S C's we have in the concert
> hall. Now one of these instruments I had just done a basic Stanwood job
> on and in that process had taken pains to polish both the balance rail
> and front rail pins, and to coat them with CLP. This instrument was not
> as bad as the other, according to this professor, but both were far from
> optimal and he proceeded to demonstrate what he meant.
>
> He showed me that pushing a bit sideways on the key whilst pushing
> downwards revealed a lot of friction. So I started checking it out by
> over emphasizing the sideways component of depressing a key and found
> that there was actaully quite a bit of drag there. Not immediately
> knowing what the cause was I told him I would see what I could do.
>
> I took the worst of the two and removed the action, top action, and
> started looking at the key bushings. They were a bit worn, and I was
> aware of that before hand. There was also a blackish buildup of some
> combination of dirt dust and corrosion from the pin. So I decided to
> just try and add a couple drops of CLP to each bushing and also re coat
> the pins.
>
> The affect was astounding.  We normally think when we play that it is
> just a downward motion of the key we are dealing with.... but this
> experience has demonstrated better then any other I have had that there
> is much more to it then that. The action feels and plays like silk
> compared to how it felt before this treatment.
>
> I waited a week to see if it would last at all, found it did and did the
> same thing to the other C. In both cases I will have to replace the
> bushings sometime in the near future anyways... but I think I will give
> them a drop or two of CLP when I do.
>
> Anyways... the professor hunts me down today at lunch, he had just
> gotten done useing one of them and just had to tell me how unbelievable
> the difference was. He was right.... I still am very much suprised at
> how much a difference was made.
>
> So listen to Newton and his "polish the darn Key pins" line.  I for one
> have learned not to underestimate the value of the least possible
> friction (of any kind) between key pins and bushings.
>
> RicB
>
>
>
> --
> Richard Brekne
> RPT, N.P.T.F.
> Bergen, Norway
> mailto:rbrekne@broadpark.no
> http://home.broadpark.no/~rbrekne/ricmain.html
>
>
>