The ones in my sig, TreeBox, and the Efusion DNA 200, plus just to throw it a curveball i threw it on my old MVP 30...same problem on all 3. Tired of this i contacted my mate under whose account we both ordered one and got him to check his (he hadnt even unwrapped his yet) on his identical Efusion DNA200 and it fits his and other mods perfectly, no wobble or gap. So its clear mine is defective.
Im getting rather tired of returning badly made stuff, thats the 5th dodgy (for a range of reasons) tank in a year.
So yet again, ill get screwed on the postage sending it back and ill come out on the minus side.
At least when i sent my Crown tank back the lovely head of Uwell i sent my tank to personally refunded the postage as well, and threw in a replacement tank which i paid forward (its had mixed success with its owner). Once i get screwed by vape gear that brand/model is dead to me for good, i do not do replacements. The only company ill give a second chance to is Uwell, they at least did do customer service (unlike say, JoyeTech), admitted there was an issue openly (unlike say, JoyeTech) and resolved it (unlike say, JoyeTech)
Vape manufacturers need to lift their game.