Originally Posted by HillRider
The headset in question isn't "conventionally threaded". I've worked on a lot of conventional threaded headsets over the past 20+ years and never came across one with a separate lock ring below the top nut so this design is a bit unusual.
I have that very headset in front of me, stripped off a Miyata 312. The lock ring is indeed threaded, and does not have a setscrew.
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