I recently purchased The Gripper with stealth vaping in mind as well as a back up to my back up, etc. I also purchased the 510 extension/adapter so that I could attach a tank to it. While it all functions well the addition of the tank makes it lose it's stealth. I believe a cartridge of some sort is in order. While I have a basic knowledge of cartridges I have zero experience with them and have no idea what I need for my new toy. Anyone have experience with The Gripper that can offer some guidance?