For most putters using the arc stroke, but not all, they will use more of a normal regular left hand grip up on top this way with the thumb on top again straight down but you will show some knuckles right here which allows your forearm to be a little more in a normal golf positions which allows a little more release. If I am using the putter that has the toe hanging down, I am using a little more of an arc stroke like Brad Faxon, Ben Crenshaw and Tiger would have their hands more like this. Again they still use a reverse overlap with the left forefinger over the top of the right hand, putting the whole right hand on the putter. From this putting set up everything is the same almost as a normal grip, except the thumbs are right down the center of the shaft. That is a very easy guide. It is almost as if you can draw something on the ground with your thumbs. If you put your right forefinger down a little more you can almost visualize having a pencil, like the shaft is a big pencil and you are drawing a little arc on the ground. I know that has been a wonderful thought for a lot of players to putt better. This more normal grip set up, the reverse overlap, thumbs down, this allows more of a release. It is used by many great putters, almost all of whom have arc strokes.