This headset turned into the build's "feature problem". The lockring wouldn't come off with my puny notch wrench, and I resorted to using deathgrip pliers (guh!). The fork threads and adjoining toothed spacer suffered collateral damage.

The fork threads were freed up easily enough, and it turns out 27" threaded forks are fairly cheap and widely available (if worse had come to worse).

But this three-notch lockring is a mystery. It isn't part of the retail Tange MA-60 stack or its (modern?) update, the MA-60C. The MA-60C itself shows up in a fairly recent Tange product catalog, but I've yet to find an aftermarket source for it (OEM-only item?).

I like the look of the knurled adjustable race, but a new one with wrench flats is probably the only practical way to go.

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