This is my first vintage bike and as such it is also my first threaded headset. I went to go take the headset apart to clean and repack it since it's been 30 years since it's been touched (never been serviced) and I was expecting to take the big nut off and then be able to move the top adjusting race. Instead, what I found was this: (see pictures at link below)

http://picasaweb.google.com/nathanie...y=FXmdwnufrqI#

It looks like there is a second lock ring that looks very similar to a lock ring on a bottom bracket. It appears to have teeth on the bottom of it that lock into similar teeth on the top of the race. How do I get all this off? I was only expecting the first lock nut that is visible when the headset is fully assembled.