Justin, I'd l like to use that picture to teach my bike mechanics class this summer. Where did you get it? I'd like to see if there's a higher-res version.
Thanks.
If you're not a wordy, like me, you can stop reading further:
If I remember right, Jobst Brandt said the proper word for the little notches that the bearing gets in this way is brinell. He used it as a verb: the headset is brinelled. I just looked the word up and don't find any listing of the word as a verb.
Merriam Webster's dictionary lists "brinell hardness" as a noun:
: the hardness of a metal or alloy measured by hydraulically pressing a hard ball under a standard load into the specimen
So I guess this means that the brinell hardness test will damage the surface to find out how much force the surface can (and can't) withstand. The resulting damage somehow took the name brinell, too, or at least in informal speech among mechanical engineers.
Unfortunately, though he's alive, I understand Brandt is disabled so badly that he can't write about it any more. I'm sad about that.