I have a semi-integrated headset for a 28.6 steerer. And my fork is indeed a an alloy 28.6 steerer.

The problem is the compression ring/centering sleeve that is supposed to fit over the steerer and and into the top bearing. It won't fit into the top bearing at all!!!! WTF?

What can I do? The sleeve is plastic...so I COULD in theory just squish it in there...but I'm pretty sure it won't come out easy. I'll probably have to tear it back out. Or I could try to sand down the alloy steerer just a bit...but I'm sure that's not recommended.

I don't get it. Help?