Have you tried to double-click on something only to miss by just a little on the second click? Make sure you are holding the mouse properly. The picture on the right shows the wrong way to hold a computer mouse. Too much weight from the hand is on the mouse.
Most of the weight from your hand should be on your desk. Your wrist and the base of your hand should rest firmly in one place in such a way that the mouse can be easily pulled from under your hand.
The mouse should be moved using only the finger tips. As you move the mouse, your wrist and the base of your hand should not move around the desk. The only time your wrist should change location on the desk is during a major cursor move from one side of the screen to the other.
By using the fingers to guide the mouse instead of using the elbow, more precise movement with much more control will keep the cursor under control. During a double-click there should be little more touching the mouse than the finger used for the clicking.
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