If your putting stroke moves off line or is not smooth, you might think about making your putter heavier. A heavy putter will tend to give you the pendulum-type stroke that you want, as gravity will play a greater part in the swing of the putter. You may add lead tape to the bottom of your putter or add weights in some of the newer models. Also, adding weight to the butt of the grip or back weighting is a very popular way of settling down a wayward putting stroke.