[CAUT] Which S&S replacement action parts?

[Fred Sturm]

On Jun 25, 2008, at 7:47 PM, Barbara Richmond wrote:

> I haven't worked on many newer Steinways with the low friction but  
> firm
> cloth.  Actually, I have strips of it and I haven't figured out yet  
> how
> anyone has determined that it is so firm.

Hi Barbara,
	The felt itself isn't particularly firm. In fact, it might be on the  
spongy side. After the parts are pinned, the centers are dipped in a  
solution of a teflon-like substance. It hardens in the felt. Around  
the edges of the dipping baths, there is white substance where the  
solvent has evaporated and left the solids. It feels much like what  
you get if you let McLube evaporate.
	The firmness of the bushings comes from impregnation of the felt with  
the lubricating substance.
Regards,
Fred Sturm
University of New Mexico
fssturm at unm.edu