This is from a previous post. I had the exact same problem with a Vivi / Vamo and got the shorty adapter.
I just received my second Vamo and thought of a suggestion. The threading on the 510 connection of the Vamo is kind of cheap. My first one was a little reccessed so I had to get a shorty adapter. It was fine because I did not want to wear down the threads on the vamo, screwing on different devices. Since where you are buying from has adapters you might go ahead and get one each of these. You will be able to attach anything (Kangers, tanks, etc) plus save on thread wear.
https://smoktek.3dcartstores.com/eGo...mod_p_103.html
https://smoktek.3dcartstores.com/510...der_p_209.html