The Track Drill
Place two clubs on the practice green parallel to each other, like a train track. Aim the track towards the middle of the hole. The width of the path should be slightly wider than the width of the putter. With a pendulum like stroke putt twenty balls into the hole. Using a pendulum motion will maintain a square putterface, thus a straight putt. While performing this drill don’t let the putter touch the shafts with your putter.When this drill becomes second nature, make it more difficult by closing your eyes. Doing so will also increase your feel.Use this drill only for short putts, 6 feet and shorter.

Line Drill
Create a 10 foot straight line by snapping a chalk line on the practice green beginning from the mouth of the hole. Align a golf ball on this line and stroke the ball with your putting stroke. During the stroke keep the putter along this like to help create square contact with the ball. Use this drill for short putts 6 feet and under.