To hit good solid well struck putts all the time is to keep your center still while making the stroke.  You want to feel your bottom and hips stay still while your arms are swinging from your shoulder joints.  A big reason that players miss hit putts is because of some type of movement during the stroke.  A great way to stop the movement is to visualize and feel your center staying still during the stroke to make solid contact.  Also, do not forget to have the putter head follow-through past your front foot.  We do not wnat to decelerate during the putt.  If you have any questions, please see the boys in the golf shop.

Good Luck!