You not need this metal O ring,its only decoration ;).Here is my wick:

I m use 85 VG+ 10 PG + 5 Water,6 wraps 26 AWG,and honestly,without this metal O ring is vape more smooth and better,also is flavour now more fantastic.And nice greetings from Slovenia :D.
Edited on 1/31/2016 at 7:56 AM. Reason: