Ever watch an old golf broadcast and see a player standing behind their ball, dangling their putter like a pendulum in front of their face? That classic move, called plumb-bobbing, is a green-reading technique used to find the true vertical line and see the slope of a putt. This article will break down exactly what plumb-bobbing is, how it works, and provide a step-by-step guide so you can add this old-school tool to your green-reading arsenal.
At its core, plumb-bobbing is a method for seeing the break of a putt by using your putter as a reference for a perfectly straight, vertical line. Think of a carpenter using a plumb line - a weight on the end of a string - to find what’s truly vertical. In golf, your putter acts as that tool. By letting it hang freely from your fingertips, gravity pulls it into a perfect up-and-down line. When you line this up with your ball and look toward the hole, any slope on the green becomes immediately apparent by how the hole sits relative to your perfectly vertical putter shaft.
You’re not trying to measure anything exactly. Instead, you're creating a visual contrast. The ground beneath your feet can play tricks on your eyes, and optical illusions on greens are very common. Hills in the background, the way the grass is mown, or the angle you're viewing the putt from can make a straight putt look like it breaks, or hide the true curve of the ball's path. Plumb-bobbing cuts through those illusions by giving you an unwavering vertical reference point. It’s a way to trust physics over your sometimes-faulty perception.
Before you even think about dangling a putter, you must know which of your eyes is dominant. Plumb-bobbing is a one-eyed process, and using your dominant eye is essential for it to work. If you use your non-dominant eye, the reference line will be off, and your reads will be inaccurate. Don’t worry if you don't know which eye is dominant, finding out is simple.
Follow these quick steps. It’s best to do this while looking at an object at least 10-15 feet away, like a light switch or a doorknob across the room.
Once you’ve identified your dominant eye, you’re ready to learn the technique. Every time you plumb-bob, you'll be closing your non-dominant eye to get a clear, accurate picture.
Like any golf skill, plumb-bobbing requires a consistent routine. It might feel awkward at first, but with a bit of practice, it becomes a quick and natural part of your putting preparation. Grab your putter and give this a try, even on the carpet at home.
Walk about five to ten feet behind your golf ball, on a direct line to the hole. You want to see the putt from a straight-on perspective. Standing too close or too far away can distort the view. Make sure your head is upright and your body is in a stable, balanced position. Don’t tilt your head - this is a very common mistake that will throw off the entire read.
Hold the putter by the very top of the grip using only your thumb and forefinger. Use the hand on the same side as your dominant eye (right hand if you're right-eye dominant). The key is to let the putter hang completely freely. If you hold it too tightly or with more fingers, you’ll unconsciously influence how it hangs. Let gravity do all the work.
Extend your arm straight out so the putter hangs down. You need to position the putter shaft so that it creates a single line of sight that runs from your dominant eye, through the putter shaft, and directly over the golf ball. Your dominant eye is the rearview mirror, the putter shaft is the gunsight, and the golf ball is the target. The putter should hang straight down between you and the ball.
This is where your dominant eye takes over. By closing your non-dominant eye, you eliminate the double vision and visual "noise" that can interfere with a clean read. You’ll be looking at the world through a single, focused lens.
With your non-dominant eye closed, adjust your arm position slightly until the hanging putter shaft visually "splits" your golf ball in half. The shaft should appear to run right down the middle of the ball. This act anchors your vertical reference line to the starting point of your putt.
Now for the moment of truth. Keeping your dominant eye, the shaft, and the ball aligned, observe where the hole is located in relation to the putter shaft beyond the ball. Here’s how to interpret what you see:
The distance the hole appears to the left or right of the shaft gives you a sense of the amount of break. A hole that seems way off to the side indicates a big swinging putt, while a hole that’s just peeking out from behind the shaft suggests a subtle break. Honing this ability to judge the amount comes with practice.
Plumb-bobbing is simple in theory but easy to get wrong in practice. Be mindful of these common errors, as they are the primary reasons why golfers try the technique and decide it “doesn’t work.”
If plumb-bobbing is so effective, why don’t you see every player on the PGA Tour doing it? While legends like Jack Nicklaus swore by it, green-reading methods have evolved. Many pros today use systems like AimPoint, which involves feeling the slope with their feet to calculate the break. However, this doesn't make plumb-bobbing obsolete, especially for amateur golfers.
Its greatest value today might not be for reading every single putt, but as a training tool. If you struggle to see break with your eyes, practicing plumb-bobbing can train your brain to recognize slope more effectively. It helps you connect the feeling of a slope in your feet with a clear visual confirmation. Spend some time on the practice green plumb-bobbing putts and then hitting them. Over time, you’ll find you need to rely on the technique less because your eyes will start to see the breaks on their own. It’s an exercise that sharpens your most important green-reading asset: your visual intelligence.
Plumb-bobbing is a classic, feel-based technique that can bring clarity to your green reading by cutting through optical illusions. By understanding the principles, finding your dominant eye, and following a consistent routine, you can use it to confirm what you see and build confidence over the ball.
Mastering skills like plumb-bobbing takes practice, and calibration is a big part of that learning process. With our Caddie AI, you can get an immediate second opinion to check your work. After you plumb-bob a putt to read the break, you can ask Caddie for its analysis of the same putt. This instant feedback loop helps you learn faster, confirming when your read is correct and helping you understand why it might have been off, building your green-reading instincts more quickly than trial and error alone.
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