For many years as long as I remember since learning that a hockey slapshot was not the proper golf grip (damn gilmore), I have been using a overlapping grip. Recently I have realized that to keep playing the game I am forced to go to a 10 finger grip with both thumbs pointing down the shaft with neither hand overlapping at all. Welcome the modified "Happy Gilmore" grip back in. The metacarpal bone in my left thumb upon impact dislocates at the base joint near the wrist, which makes a nice popping noise. In quick reaction to pain I let go with left fingers partially and the joint further up the metacarpal at the main joint will partially dislocate too since right hand is holding left thumb against the shaft. Been trying this the last couple of days and man do I have a mean duck hook now.
What grips have you tried before?
Sam,
Have you tried rotating the thumbs over to the right side of the shaft slightly? (Still "on top" but rotated over so they align to the right of the "top" of the grip.) I think rotating the thumbs over to the right (you are right handed?) will rotate the right forearm into a less dominant position. (Or since you are using a split grip, can you rotate just the right thumb more over to the side of the shaft?)