Benefit #2: It increases confidence and skill in handling needles.
One of the first things you will notice when you see a talented acupuncturist working with needles is how adeptly the needles are handled. Confidence and skill with needles comes with practice. In the beginning, we all fumble awkwardly as we try to force a needle handle into the tube with both hands. There is almost an appearance of fear, as though the novice is afraid of being stabbed by the needle point.
The one-handed turn forces you to move the whole length of the needle across your hand, protected and sterile in its tube. With frequent practice, you develop a kinesthetic awareness of exactly how long the tube is. With this awareness, you will rapidly move through your own apprehension in handling needles and get rid of any awkwardness in your needle technique.