ilyk2win
Addicted to Softballfans
I hold mine similar to how Country described except I use my middle and ring fingers, almost like a Spiderman look I guess. I don't dig my nails in but rather the face of my nails on the smooth part of the ball and extend those 2 fingers at release - push the ball - to get the knuckle effect. 95% of what I throw is some variation of a knuckle ball.