Hold the flashlight in your weak hand with your thumb on the tail of it (if you have a tactical tail switch) Hold your weapon in your strong hand straight out, with your eyes lined up with the sights. Your flashlight (weak hand) is held up to the side of your head, right by your eye, illuminating both your sights and your target at the same time. The idea behind this, is that if you dont have night sights, it makes it a lot easier to line your sights up opposed to using the Harries, Modified Harries, etc... where your sights are completely dark, and all you can see is your target.
Some might not like this technique, and im not sure many people have heard about it, and I didnt think I would like it at first, but its what I used to qualify, and I like it a little better than the Harries. I like the Harries because of the extra support it gives your strong hand, I like the Puckett because of the fact that it helps illuminate the sights a great deal