Do this little excercise and it will explain why you should concentrate on the target and not the pin. Look at something across the room. Now make a circle with your thumb and forefinger. Now look at the circle and try to keep the object that you were looking at centered in the circle
.................................................. .................................................. .................................................. .........................................Did you notice how much the circle was moving?




Now do the same thing only this time focus on the object and completely ignore whether or not it is in the middle. Just focus on the object.
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You will notice 2 things. One your subconscious will automatically put the object in the center of the hole. Even if your hand floats off your sunconscious will guide it back. The second thing you will notice is that there is much less movement when you use this method. JMO