I ordered and recieved a Nodal Ninja 3 Mk II (in the UK) after Christmas. It was ordered on Dec 29 and arrived next day!!!

After I tried out my NN3 I noticed that the rotator had a gold coloured powder (brass) looked at the detent ring I used and noticed that there it was scored with a shallow groove.

My question is; is this normal? Did I over-tighten the rotator (I tightened it so the there was no wobble), how tight should it be, or is there a problem with the detent plunger adjustment?

Any advice would be greatly appreciated.
Mark