Tips n' Tricks Thread. Please feel free to post you eCig related tips and tricks to help others here I'll start. The Chrome Tanks can be a haven for broken finger nails and scratched chrome if you are not aware of the proper method to remove the end cap and fill. Here is how I do it. Step 1: Hold the tank upright Step 2: Pull the carto out a bit from the bottom Step 3: Now slightly angle the carto and push back in, it will pop the top off. Done Now fill and enjoy.