The wrist blocker is the best drill for training the wrists to remain "quiet" during the stroke. Wedge a ball between the left wrist and the putter shaft; if the ball drops during the stroke you have over-active wrists.
A great drill to feel the correct rocking motion of the shoulders during the stroke. Wedge a club shaft under your upper arms, make your stroke making sure the shaft stays as parallel to the target line as possible.
The shaft connecter will give the correct feel of the hands, arms and upper body working together. Grip down on the putter shaft and place the butt end against the sternum. Make a few practice strokes without the ball and then go back to your normal position; it should feel much more compact.
The railway track is a very popular drill amongst most top professionals. There is no better way to groove your stroke then practice this drill on a regular basis. Find a flat area on the putting green and place two clubs on the ground (just a litle wider then your putter head ), creating a railway track to the hole. The distance from the centre of the clubs should be no more than one and a half meters from the hole.
NB: Most profesionals try to make a hundred putts in a row, which means if they miss one they start again!!!!!
The drill is very similar to the shaft connecter drill. The hand connecter will give the correct feel of the hands,arms and upper body working together. Place the hands back to back with the right palm facing the target. Make a few practice strokes and then make several strokes with your putter; it should feel much more compact.
The look at the hole
If you are struggling to get the right pace on your putts, this drill will really help. Make a practice stroke keeping your eyes on the hole the whole time, then make your putt the same way. Keeping your eyes on the hole will train your brain to feel the correct length and speed of the stroke required.
The foundation of great putting is your putting stroke. If you're standing over a putt thinking, being confident is not going to be enough. However, once you have a solid stroke it's almost as if you can't miss, especially within 5 feet and pretty soon you are truly confident. See : The putting stroke