Joined: Feb 2012
Posts: 19,353
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From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
A simple single hooked lock ring tool will work. Much like a BB lock ring tool. However these headset lock rings are usually smaller in diameter (as well as typically have an odd number of notches) so the usual BB ring tool doesn't fit well.
So a few options. Use channel lock pliers, sure some surface chrome damage will happen but that ring is covered in use. Use a Bb ring single hook tool (like Park's HCW-5) buy place a straight blade screwdriver under the tool's curved edge about 1/3 of the way around the ring to better have the hook engage the notch. Or get a proper small diameter ring hook tool (like Park's HCW-17 or the venerable Hozan double ended Lock Rink tool [aka Rock Ring tool]). Andy
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AndrewRStewart