I have a ~2mm gap I don't understand and can't fix that didn't use to be there. This is from a carbonda 696 with the supplied headset, barely ridden only about 50km worth of shakedown rides
The lower split crown race don't sit flush with the lower headset bearing no matter what I do, I can't press it with my hands, tightening the steerer plug does nothing and there is no excess grease
I've tried fully omitting the split crown race like some people report but it steers like shit. But the gap disappears which confirms this is the culprit
Unless I'm crazy I think they used to sit flush and are supposed to