The number one mistake in putting is moving your head too early or peeking as I call it. This comes from curiosity to see where the ball is going to go. If the head moves, the shoulders move which in turn means the club won’t swing on line. This will lead to miss hits and inconsistent starting lines. 

This simple drill can be used whilst practicing, obviously we cannot do it on the course so I rather have you focusing on a blade of grass instead. 

The second part of this drill is to keep the finish for a count of 3 seconds. What you will notice after doing this drill, your ball striking will improve and therefore so will the roll of the ball going end over end. You will soon get into a great habit of a solid finish and making more putts.