I'm still confused on this...maybe I'm doing it wrong. I have the v4, and without the needle, the hidden cap system works by retracting when pushed on. When I have a needle in the pen, the cap barely retracts, and the needle (5mm) is not exposed at all, I have to remove the cap before injecting my research rat. seems like the needle is preventing the cap from retracting, or maybe I'm doing something wrong. Any help would be appreciated.
C
carlo
@carlo