I received a 2013 stealth a few day's ago. Funny thing is I believe the bottom tube is too short. The stealth cap would not screw all the way down while using a aw 18350 battery....So I measured the new bottom tube it is 41mm... The 2012 bottom tube I have measures 45mm.. The only way I can screw the cap all the way down on the 2013 is to remove the spring..Has anyone else had this problem? In the picture 2013 on the left 2012 on the right.