Now look at the atty. Look at the end that goes into the battery. You will see( from the center ) a hole, then a white ring, then the threads. The part inside the white ring ( containing the hole ) moves. It needs to be at least flush with the end of the threads. If it isnt it wont make contact with the battery properly, thus making it unusable. If your fingernails are long enough, you can get them under that movable post ( ALWAYS DO THIS GENTLY ) and lift it ever so slightly. I keep my nails cropped very short so I use the business end of some tweezers ( VERY GENTLY )
If that doesnt work and you think the problem is due to the atty being dirty, you can soak it in iso alcohol, vodka or everclear.
Watch this video:
Thats Cozzicon. He knows his stuff. Be sure to look at his you tube channel
HERE
He has a ton of videos that have been extremely helpful
Lastly, order up at least 4 extra atomizers ( check them as soon as you recieve them ) Ive been lucky and have only had one Atty die on me. Others I resurrected using Cozzions video. The weird thing about atomizers is they can last two months or two days. You just never know. Having extras is a must.