That's just for a bit more stack. If the thread doesn't go down far enough, the top race of the top bearing won't sit down on the headset. You could put a spacer under the crown race, but POC.
@Alfie started
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That's just for a bit more stack. If the thread doesn't go down far enough, the top race of the top bearing won't sit down on the headset. You could put a spacer under the crown race, but POC.