[CAUT] after ring on bass damper

[Susan Kline]

>The cause is a combination of too much glue, graphite on the bushing 
>or flaking of the plating on the center pin.
>So far I have not had a call back on the ones that have been reamed 
>for the correct size center pin.
>One piano had a sudden seizing only after 30 minutes of playing.

I have never had to pin a single center on the seizing Samicks more 
than once. Repin once well, and you're done.

When a piano doesn't seize when you first sit down at it, and then as 
you play it gets more and more sluggish and seizing, that is a good 
diagnostic for the scraping center pins (like Samicks sometimes get). 
The crumbling plating (I've never seen a non-plated pin which seized 
like this) tangles in the woolen bushing fibers, causing friction, 
and the friction heats the pin up, so it seizes worse.

It's been my experience that other types of sluggishness tend to get 
better instead of worse during a playing session, if they change at all.

Susan Kline