Look for forward lean plus upward attack in putter fitting
The speaker says that on most players they like to see the shaft lean forward slightly to reduce a little loft, paired with an upward angle of attack to create a bit of lift and roll. That delivery is what lets them stick with a fairly neutral putter spec.
Channel: Club Champion
Watch official source at 4:27Why this context matters
A fitter describing the putter delivery they look for during testing.