Is there a trick to installing a new coil on my Atlantis tank. I recently received it an it works great, but when I tried to switch coils to insert a new flavor of e-juice, I was able to remove the old one but cannot insert a new one. It seems ass if the coil is too long to go into the bottom part of the unit and every time I try screwing it in it will not start on the threads. I've tried the old coil that was originally inserted into the tank when it arrived and it will not go back in either. Nor will a new coil from a brand new 5 pack. I'm pretty confused.