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I work with tapered roller bearings alot in my line of work, and have never seen a "GAP" that was supposed to be there!
If you are using a tapered roller bearing, it means that there is high "side loading". This is trying to push the outer race against an immovable object (hub). In order for the bearing to support this load, it must have full contact with the immovable object (hub). If it does not, it will warp and destroy the outer race.
Remove the race, and clean up anything underneath it.
That being said, I have never done this to an FC, soooo I could be way off base (it would be very strange indeed!).
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