1, the first joint of the thumb ventral surface of the right side of the upper contact with the pen barrel

2, the index finger tip off the side of the direction of the middle finger, in the thumb contact closer to the tip of the pen position, the index finger and the thumb directly can not be close to each other, there should be a little distance;

3, the pen barrel contact with the nail of the middle finger The lower part of the first joint line on the upper position;

4, the barrel of the pen leaning on the root of the index finger bone knuckle bulging position near, not far away.