Existing flat putters can send a ball in the desired direction when the ball is struck straight towards a target, but the ball will deviate from the desired course due to incorrect hitting direction and head rotation during Pull (pull the swing towards the body during the strike) or Push (push the swing towards the outside). Like the flat putter, the Finale™ also has the same phenomenon of which the striking point between the ball and the hitting face of putter is changed by the rotation and the up-down translation of the putter head itself, but with the dual friction effect on the hitting face and the feature of changed hitting face slope on the shifted hitting point, it has a self-corrective function that automatically corrects any directional error in the ball's trajectory caused by the player's incorrect swing.