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It was on my Cotic until recently, click free (but a different headset) and I've ridden it once click free on the Geometron. I've taken the wheel out, stood on the bars and wrenched the lowers about and there's no creak, so I'm pretty sure it's not the CSU - or I'm not strong enough 🤷🏼♂️
Weirdly, I managed to make it click with the bike upside down on bars and saddle, and pushing on the downtube, so pressure going through the headset but not the fork
Can you put the fork on a different frame and test that? I'm just wondering if it's the crown/steerer.