Good question Neal. I actually use regular fan grip in my putts, where I place my thumb on top, my index finger on a rim and my other fingers on bottom of a disc. My pinky is touching the inside rim. When I putt, my grip is quite loose until the stroke (hit). During the throw, I press my thumb towards to my middle finger and I imagine that my putter is that tiny piece of plastic between my fingers. I will “spin” that piece to the target. My index finger is controlling the disc angle.