The most important of these , the rail nurse , involves the progressive nudging of the object balls down a rail , ideally moving them just a few centimeters on each count , keeping them close together and positioned at the end of each stroke in the same or near the same configuration such that the nurse can be replicated again and again .
The most important of these nurse techniques , called the rail nurse , involves nudging the balls down a rail , moving them just a few centimeters on each score and keeping them close together and positioned at the end of each stroke in the same or near the same arrangement so that the rail nurse can be repeated .