I've been lurking for a couple weeks as I'm new to this whole vaping thing. I just got my Vamo from Smoktech in the mail. Question, is there suppose to be threading at the seam just under the fire button? Mine doesn't have any so when I but the batteries in and start to screw on the end cap the pressure from the spring makes the unit come apart at that top seam(under the fire button). Am I missing something here? Did I get a defect? I'm so bummed I had been excitedly waiting for it.