Hi there, folks! I just rebuilt a head on my ViVi Nova and it's acting strange. First of all, I'm using a chrome "Lambo" LavaTube from Young June. My problem is that the Nova's only working when screwed in very loosely, when it used to work while screwed in all the way (not too tightly, of course). I have it so loose that it wiggles. I'm not sure what the problem could be. Can someone throw me a bone?