Does anyone have one of THESE? I have just bought one from OCUK and it arrived today but either I'm reading the description wrong and it doesn't do what I think it should... or it's faulty. It's a rotary and says "Dual 360-Degree Rotation" so it should turn all the way round on itself, right? Mine doesn't... it's just stuck in the position that you screw it in as when tight... i.e the valve is basically upside down and I can't rotate it independent of itself.

