Hi, have never used a tank with a replaceable head before and I have a question. You have to disassemble the MPII tank to refill it and the atomizer head seems to just slip into the tank and is held in place by screwing in the adapter ring. Does that sound correct to you that are familiar with it? I don't see any way to particularly align it or snap it into place. Just push it in and screw on the ring. Seems to work ok doing that but I'm just double checking. Thanks!