with what?
I've been vaping rda's on vamo's since Nov 2014.
===edit===
Oh, the biggest issue with mods like the vamo and zmax is the usual 510 center pin issue just like on regular ego batteries; you have to be carefull not to overtighten your tank/topper.
On a regular ego battery what you do is use a beauty ring, and if you use a protank type topper you leave the base on semipermanently.
Similarly with the vamo for example, you screw on your topper and that collar at the top of the vamo, you unscrew that upwards to lock onto the topper; again you leave the base on semipermanently so you don't keep interfereing with the 510 thread connections.
My vamo3 I had to change the centerpin insulator after 3 months, then again after another 3 months; guess I put in a better one the last time because it's been running a full year unchanged; or maybe its just that I've been taking better care of it; for a replacement centerpin insulator I used one of those grommets that are on the end of a protank coil.