Tommy Fleetwood made his fourth putter change of the season, moving from the larger Spider Tour into a smaller Spider Tour X.
Fleetwood entered the week ranked 93rd on Tour in putting after finishing 20th a year ago.
The switch wasn't just about head shape.
TaylorMade rep James Holley said Fleetwood liked the slightly more forward CG, but also found an alignment benefit from the Spider Tour X's TruePath outline.
Even though the aid is blacked out, Fleetwood felt the "shadow" of the shape lined up naturally with the ClearPath markings on his TP5 pix golf ball.
Early returns were good: Fleetwood gained nearly 2.5 strokes putting in Round 1 and opened with a 67.