How has this been for you since?
I had the same problem - but I now have to tighten the nut underneath the smooth cover/collar after ~15miles as it keeps coming loose by 1/5th of a turn.
I cant tell if there is meant to be any additional retaining nuts, or if I should try tighten further, or use some loctite on it.
Has yours stayed tight or do you see the same thing?