My first foray into vaping was a No. 7's (E Cigarettes By Choice 7's) kit. Soon found it really wasn't my cup of tea and moved on to bigger and better things. But, I'd like to find a way to adapt them to use with something other than their standard carts. Doesn't anyone know what thread-type they use? Tried a 4081 to 510, but that didn't work so I'm not sure what's what or if they use a proprietary style that nothing matches. Any help would be greatly appreciated!