These cartos I just got from madvapes don't look like the eGo or Tornado ones. These are joye 510 mega. I tried the condom method using mouthpiece and battery end both but the condoms aren't as tight as the ones on other joye stuff i've had. When I pull the carto out the juice is mostly still in the condom. I did discover that it fits tight enough that when I put the carto into the condom full of juice, cover the hole at the other end and shake it..when I take the condom off it is empty. These don't seem to have the second rubber plug under the mouthpiece. I just don't want to ruin them trying to figure it out.