This 5-Second Putter Trick Instantly Reveals If Your Aim Is Off

Most golfers who miss a makeable putt blame the read or the speed. More often, the problem started before the stroke — the putter face was never aimed where they thought it was.
That's the diagnosis GOLF Top 100 Teacher and PGA Tour putting consultant Stephen Sweeney gave during a recent lesson with a player whose putting had gone cold. His fix requires no launch monitor, no laser, and no training aid. It requires a phone.
Sweeney set the back edge of a phone against the putter face, then had the player look down that line. The face was aimed off the right edge. The player had felt square the entire time.

"If I go ahead and set the back of my phone up to your putter face, and you come back and look down that line, you can see [the face aimed] on the right edge," Sweeney said.
The reason the check matters is that face angle is the dominant variable as putts get shorter. On a putt inside a few feet, a face that is open or closed by a couple of degrees is often the difference between the center of the cup and the lip. Line and speed get the attention, but the face decides where the ball starts.
The problem is that golfers are poor judges of their own aim. Habits built over years — a slightly open setup, a grip that closes the face, a ball position that drifts — can leave a player feeling square while the face points somewhere else. Bad habits don't announce themselves. They just show up as missed putts.

Sweeney's second version of the drill removes the technology entirely. A playing partner places a square edge — a scorecard, a club, anything with a straight side — flat on the ground against the putter face, lined up straight down the intended line. The player then steps in, takes the setup, and looks down the edge to see where the face actually points.
The value is in the feedback loop. Once a golfer can see the gap between what they feel and what is real, they can start adjusting the setup, the grip, or the ball position until the two match. Without that visual, the adjustment is guesswork.
Sweeney's approach fits a broader pattern in putting instruction: the most useful checks are often the simplest ones, because they can be repeated on the course, before a round, or on the practice green without equipment.
The open question is how much of a golfer's aim error is correctable through setup changes versus how much is baked into their stroke. For players who have spent years aiming the same way, the first look down that edge can be uncomfortable. What they do next is the part that decides whether the putts start dropping.
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