Young Chang Syndrome

[Susan Kline]

Del wrote:

>  Mostly the problems only developed in the hammer butt
>flanges.  Which makes sense -- the angle of rotation is fairly great and the
>stress loads are high.  When compared bushings between the parts that gave
>us problems with those that did not, we found that there was considerably
>more graphite in the frozen parts than in the non-frozen parts.  At least
>the bushing cloth in the parts we had the most trouble with was considerably
>darker inside the pin hole than was the cloth in parts that did not exhibit
>these problems.)

I noticed that the cloth was darker, but if I thought about it, I believe
I thought that the metal fragments had darkened it.

Although hammers are the worst, I have seen seizing plated center pins in
every action part, including the underlevers and the rep levers. I have a
lovely photo of a Samick wippen lying on a table, with the jack sticking
out through the rep lever, even with the spring still in place. It was like
the piano was sticking its tongue out at me.

Susan