For the high price of $5-6, you can buy yourself a metal yardstick at a hardware store and it’s the greatest putting aid that you can have to help you make a lot more putts inside 10 feet.
If you do the math on it, if you hit a putt that stays on the ruler for all 36 inches, you’ve started that putt within 1° of perfect. Within 1° of perfect from 10 feet, with the right speed, those putts are going in.
