In case anyone else is shopping for a headset lock ring tool:

On old threaded headsets, sometimes, there are lock rings about 35mm in diameter.
I found a Park HCW-17model, after I ordered the Hozan C-205. The Park describes a useful diameter range, but the Hozan does not. I'm hoping the Hozan has a smaller diameter...

I considered a Hozan adjustable pliers, but was dissuaded by the $50 price tag. Plus, while it would work well on notches 180 degrees apart, probably not so well on the triple notch lock rings.

Park:
http://http://www.parktool.com/product/fixed-gear-lockring-wrench-hcw-17"]http://http://www.parktool.com/produ...-wrench-hcw-17[/URL]

Hozan:
http://www.amazon.com/Hozan-Bicycle-.../dp/B0017SE6ZY