Ok, here's what you do with the 401. Take that cartridge out of the mouthpiece and toss it away. Get a small container with a leakproof cap, I find that a plain ol contact lens case works perfectly for this purpose. Put enough juice in the case so when you dip the atty in it only covers the wick of the atty. Dip the atty in there, put the mouthpiece back on and vape away. You will find that one good dip will last longer than a filled cartridge and is way more convenient.You may have to wipe off the area where the mouthpiece meets the atty, but its still way easier than filling those damn carts all the time. Works for me anyway. Good luck and happy vaping!