With so many head, grip, and weight combinations, how is it possible to really know which is the best one for you.  putter fitting is extremely complicated, few people, even at the tour level, understand it. The 2-Pill-Drill is a great way to easily see the effects of each and every minute change a putter makes in your stroke.  check out the video below to see:

 

Wedge fit with the Flat-Pill-Drill:

 

1. Full Shot: Tape up the face.  The wedge with the most center located at the sweet-spot is the right one.  If the marks are too high, too little bounce, too low, too much bounce

Here is a result from an in-store fitting. notice the wedge with the most consistent area of contact, closest to the center of the face is the Vokey K-grind.  The bounce and grind work together to make the wedge effecient for a stroke type, This player was coming extremely steep in to the ball and had a hard time finding the right wedges.   

Here is a result from an in-store fitting. notice the wedge with the most consistent area of contact, closest to the center of the face is the Vokey K-grind.  The bounce and grind work together to make the wedge effecient for a stroke type, This player was coming extremely steep in to the ball and had a hard time finding the right wedges.   

2. Chipping/Bump-and-Run: the one that gets the most consistent release to the hole is the best camber/grind and bounce for you. If the release left or right, or if you slide under (close to a double hit), the grind is wrong for you. 

PGATSS is catching on. Southlake, TX See Chris for a fitting!