On Fri, 30 Nov 2012 08:47:02 -0800, William Sommerwerck wrote:
I suppose only one world supplier of whatever this slip clutch
material is.

It's easily obtained in the US. Buy a Banquet "chicken nugget" frozen meal.
The nuggets are indistinguishable from industrial felt washers.

You owe me a new keyboard!!! :-)

Jonesy