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I know you should need to, but I can only remove the stem on my carbon Columbus forks if I loosen the expander bung.
Yep, sounds plausible. Maybe they tightened the bung too much in the factory?
So you tighten the bung back up before re-fitting the stem? Presumably the stem is then tight on the steerer with the stem bolts loose? Isn't it then hard to adjust the bearing pre-load with the top cap?
Chaley
I know you should need to, but I can only remove the stem on my carbon Columbus forks if I loosen the expander bung.