Been using ce2 carto's for awhile, just wondering if the 2nd inter plastic spacer(ring) is really needed. When filling I first remove my drip tip, then the 2nd ring and fill through the last ring, then put the whole thing back together. I haven't figured out yet what that 2nd ring is suppost to do and am temped to just leave it out. Since it sets on top of the fill ring, the only thing I can think of it somewhats cover the small injection holes in the last ring. Any ideas....