@dang2484
When mine came the grub screw holding the alternative adjustment collar was not tight and the collar was loose.
Bonus as such as i removed it and there were no marks where the grub screw should have been tightened.
I never fitted it as zero was within a chirp of zero. Saved it just in case i ever swapped out the burrs.
Looked better without it imho but beauty is in the eye of the beholder so im constantly reminded!!
Good luck.
BTW Suggested starting point is 15 ish if you are grinding for espresso.