Apex 2 o'ring #5?
Upon disassembly of my apex 2 (14") I found a fifth o'ring as the guts fell apart and I am not sure where it goes. It is smaller both in thickness and circumference than the four larger o'rings that hold the tip together. My first thought was that it sat in one of the three grooves in which the tip rotates at the end of the standard barrel that came with the setup. But I found no others of its size and as this is the first time I have taken apart the barrel I cannot imagine I lost two others. Where does it go?? No other threads or videos that I have seen mentioned anything but the four main o'rings.