Steve, N6TT, published his operation on CW in the Ustream video clips here. He is a proficient CW operator. His CW sounds smooth and elegant. He has been trying to brush up his fist for years. I was really surprised to hear his fist reached a summit as CW operator when he changed his paddle from a double lever to a single lever. His sending has become perfect. That new Begali single lever has fit his fist for sure. And I was impressed at his never ending efforts to improve his capability as a CW operator.
Apart from that topic, here I would like to discuss about the posture we take when sending CW. I found one thing in his keying different from my style. He stretched his right elbow when he manipulated the paddle. In my case, that position of right elbow makes a bit more errors in sending.
I believe it is related with the basic tension on the arm/hand muscles. In extended posture of the arm, the tension could be rather high and could make fine and quick movements of the arm/hand a little bit difficult. I mean the elbow is the main part involved in the posture. If the elbow is flexed slightly, it is easy to keep the arm/fingers relaxed. It is comparable to the performance of cello. Cellists are taught to keep the arms/hands in slight flexion as if we hugged something when we play cello. This posture tires us less and enables any smooth movements of arms/hands necessary for the performance of cello.
I won't give a lesson to such an expert as Steve as for how to manipulate a paddle. In fact, his sending is always perfect even if he runs faster than 30WPM etc. Precisely observing him in the Ustream video, his arm is still very slightly flexed. He might be feeling relaxed in this posture, maybe. I should ask him about this in the next QSO.
One more thing. The accuracy of sending is closely related with our mental condition and/or alertness. It is interesting that whenever we try to make it perfect, we shall make more errors. Being nervous about the accuracy often worsens it. The relaxation in mind is always as crucial as the relaxed muscle tone. Nervousness may directly affect the muscle tone. It may be again comparable to the performance of musical instruments. In addition, being alert is another factor determining the accuracy in sending as well. Needless to say, the alertness is needed in any physical as well as mental activity. Steve often just watch the band in the morning hours until the java tea gets him alert enough! He spends those hours in right way. On the contrary, when lager or dark one makes me sleepy at night, I always pull the big switch soon saying good night to him, before my sending may sound like a brain storm to him.