a little late to help the OP but for everyone else, you really should consider a 510 to EGO adapter
510 Battery to eGo Atomizer Adapter
and an EGO trim cone to dress it up
Ego Adapter for tanks
NOTE: the above links had the best pictures for you to look at. The adapters and trim rings are available almost everywhere
Curious why one would use this? I basically need two "female" ends. One to go over the putter threads of the MVP and the other end I could screw my kayfun into. Seems like a giant need for these reading around on the web.