Small Bridge Pin Source

[jolly roger]

Hi Dale,
              I think the plating failure has more to do with environmental
conditions as opposed to time.   Moisture and industrial pollution being
the main cause.   Samick has had a bigger problem due to graphited bushing
cloth.  I have examined these under a microscope, besides flaking, they
also show significant score lines.  Now what came first, the flaking, or
the score lines causing the plating to flake?
Graphite comes in many grades. Bearing in mind it is mainly carbon,
hardness can vary all over the map.  Diamond being on the extremeend of the
scale.  It is also hygroscopic.  A propensity to attract and hold water.

Roger



> Rodger and list
>
>  Just to weigh in on this one let me state that my Dad was a yamaha dealer
>for 20 yrs.  I first started seeing the de-plating problem in pianos from
>the 1976ish area but center pin plating failure isn't bound by time and I
>still see a case from time to time.  I'm guesssing I've repinned a dozen or
>so actions. Primarily the hammer flanges but also several entire damper
>lever systems as well.  Yamaha was always very good about warrantying that
>which was under warranty and once a bit beyond that.
>   Regards
>
>Dale  Erwin