Greetings automuse,  Eraser Company, Inc., is alive and well and mainly
selling power wire strippers for all sorts of wire.  The following link
is to their hand brushes of which there are about 40 different types.
The last time I was at Radio Schlock (I don't go very often) they still
had a little fiberglass eraser pencil.

  http://www.eraser.com/browsecat.cgi?mode=open&id=113

Best regards,
Spencer Chase
Laytonville, Calif.
http://www.spencerserolls.com/