For many golfers, tinkering with golf clubs is not always connected to shooting a lower score. Sometimes it’s necessary for them to play their best, though, especially on the greens where the mental game is so important. The latest creation of Happy Putter founder Vikash Sanyal is based on that belief, specifically that a new “look” can help golfers focus better on the greens.

“I call it the lazy eye syndrome,” Sanyal said. “A golfer’s eyes get lazy after a while with the same putter. A new look can refocus their eyes on the line [of the putt].”

Stacy Lewis, a 13-time LPGA Tour winner and the No. 4-ranked women’s golfer in the world, isn’t much of a tinkerer with her putter, but a new Happy Putter changed her tune. It uses adjustable alignment aids, which improved her alignment and results in comprehensive testing Sanyal did with Lewis.

It hasn’t been a seamless change — Lewis has been off and on between the Happy Putter prototype and her old putter this year — although it seems she has settled on a Happy Putter Prototype M. Lewis was spotted with a Happy Putter in the bag by Beth Ann Nichols at the ANA Inspiration, and had it in the bag at last week’s Swinging Skirts LPGA Classic. She finished T18 and T27, respectively, and is currently ranked 17th in Putts Per GIR (Green in regulation) on the year averaging 1.77.

.@Stacy_Lewis made adjustments to her highly adjustable Happy Putter and is rolling at ANA https://t.co/H1BMAiB7yv pic.twitter.com/ddOfYf1CO1

— Beth Ann Nichols (@GolfweekNichols) April 2, 2016

Her specs, provided by Sanyal, are listed below:

• Design: Prototype M
• Alignment: Shape 2, Line Pattern B
• Length: 32 inches
• Weight: “Heavy”
• Loft: “Low”
• Lie Angle: “Upright”
• Offset: “Half”

The new technology from Happy Putter, which Sanyal said is expected to be released to the public in the coming weeks, allows golfers to switch out alignment aids without changing anything else about the putter, such as weight, loft, lie angle, etc. The putter found its way into Lewis’ hands when Sanyal showed Lewis and her swing coach what he was working on at Naples National Golf Club in Florida, where Sanyal put Lewis through his personal testing process. It includes:

• Using a roll board to find out if the ball is skipping off the face.
• Lie angle testing to make sure the sole is flat.
• Trying different alignment aids to discover a visual preference.
• Performance testing. Lewis hit 6, 12 and 18-foot putts, and well as lag putts from 50 feet in an 18-hole format.

Before they began, Lewis had to pick which of the alignment lines best suited her stroke and preferences. At first she picked a single line, which was similar to her old putter, Sanyal said. She repeatedly lined up left of where she was aiming, however, so they changed to another alignment aid with multiple, alternating-color lines. Sanyal said Lewis didn’t immediately like the look of the alignment aid, but she lined up perfectly to her intended target with it again and again. It outperformed her gamer, and she recorded seriously impressive stats during testing, according to Sanyal’s records.

• 6 feet: 39/40 (98 percent)
• 12 feet: 23/40 (58 percent)
• 18 feet 7/20 (35 percent)

Like the original Happy Putter, which you can read more about here, the new model allows golfers to adjust weights, loft, offset and lie angle, although the new version does not change dexterity.