Find a straight five-foot putt and stick two tees three inches apart in front of the hole. Putt through the tees and into the hole. When you can do it consistently, move the tees closer together. (You can place them as close as two inches apart.) The gate formed by the tees is narrower than the hole, so when you leave the practice green, the hole will look as big as a garbage can.
Jim Murphy teaches at Sugar Creek Country Club in Sugar Land, Texas.