I can't see how anything have gotten into the steering head bearing since I drilled into the steering lock and not on the outside of it. I haven't drilled through the steering lock either, when I pulled the lock with some pliars the hole was clean as a whistle.
I did check for shavings and the shavings that you see on the pic got there when I pulled it out and put my fingers on it. But I can double-check.
