The bottom pin on these coils have a 1/16" air feed hole with an intersecting hole that is also 1/16". I have found these coils to be fairly decent, but lack good air flow. These holes can be opened up with a 5/64" drill bit realy easy and all though this is not a large jump in diameter is does make a big difference in performance. Since this is not a huge increase in size the drill is self guiding to the existing hole. I have run this set up on an Aspire K1 today with no issues (No leaks). I use K1 when out and about and don't feel like carrying the Pico in my pocket. The cross hole doesn't really need the increase since it's feeding from both sides, but it does remove the burr that gets pushed down. The pin comes out really easy so you just need to do this to one pin just change it out with the stock pin when you replace your coil. Make sure to clean the pin out really good when you're done as this process does create very fine metal chips that you don't want to suck up into your coil or mouth. When pulling and replacing the pin make sure to pay attention to the positive lead of the coil and it stays in proper position.
