If you bought a eleaf 100w tc and it has tank wobble do to the bad 510 threads, I have the cheap to free fix for you. When I say free, I mean pennies. Follow the link, you'll be amazed, and please, voice your disapproval of this oversight of eleaf customers for eleaf not offering to fix these products, let alone helping the people who supported eleaf by buying there products ever. Link is below.