for the mechanical seals ksb is dealing with burgmann try there site you might find something may be interesting.
by the way where is your location that could help as well.
probably it is a washer that we call (nord lock)it is a combination of two washers that are splined to prevent the loosing of a nut it has obout the same task of the spring washer.
monir_@hotmail.com
all what you need is to know about the symbols of the drawings the n i believe it will be very easy to you to do it
the most important is to practice on location for the best results.