Originally Posted by
digger
Ah, I see that makes sense now. No, that disk is part of the fork tubing, there's no seam there. Thank you, that helps a lot.
OK, you're all set, and free to deal with the cosmetics of the gap if you wish.
FWIW another reason for the dish shaped bottom is for removal. It's not critical on a split crown, but imagine removing a pressed crown race if there weren't a gap underneath the lower rim.