how do i take apart a mixer tap?

i am trying to replace the washer in one of the taps on my kitchen sink mixer tap. there is a nut(shape) but im not sure it is ment to undo.

Plumbing Novice!
bob, July 2004


done
Chris
Your reply 'undo in normal way' doesn't really help! What is the 'normal way'??
Geoffm

Geoff, April 2005
obvisouly turn supply, pull/twist off head undo in normal way.
warning- if your tap is the ceramic washer type take the cartridge toyour local plumbers merchant to match

chris, November 2004