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Home machining to the rescue!

We've a #bike brake rotor lockring that's too thin for my old 16-notch BBT-19 (built for an era when it just had to worry about bottom brackets, not super-thin lockrings) and has too much axle protruding for my BBT-69.3 (socket isn't deep enough).

There's a ton of meat in the BBT-69.3, so I just fixtured it and milled out the innards. 1. I should've done this on the SB-9 but it's currently offline; 2. I don't have a 20 mm end mill so had to make a circle by hand.