you can make it FullFlavored Kind a Guy,
1. Clamp the M3 screw in a vice.
2.Cut a shelved slot with a fine grinding disk from a Dremell kit.
3. Insert screw
thread partially into drill chuck, and apply sandpaper or a hardened file to sand down the width of the screw head so it fits inside the topcap without hindering the seating of the cap.
4.Cut a Biro spring in half or a bit less (I used around a third of the spring.
5.Slide Biro spring over threads and screw into place (screw in carefully for the first few turns as the screw can act as a thread tap and ruin the thread in the atty if you are careless, but this has not happened to me yet, just that I'm aware it could if care isn't taken)
6. Adjust screw clockwise until you get little or no leaking but still get good wicking.
7. Once you have found your sweet spot, turn the screw clockwise until it fully compresses the spring counting the turns as you go, then when you remove screw to refill, and then replace it you can turn it all the way in clockwise, and then turn it out anticlockwise the same number of turns you counted earlier. This will give you repeatable results with that current wick and coil setup.