Logitech extreme 3d pro joystick

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This joystick isn't driving the diff_drive_controller right. Forward is good, reverse is good, steering in reverse is good, but steering forward is backwards. When I want to go left, robot goes right! Is the best solution for this to remap the joystick output? I see there's a node that can change input values into others, for keypad or joystick. joystick_remapper. I see good examples and description of button remapping but none of axis remapping. Or would this behavior be corrected with different values in the covariance matrix in the parameters for diff_drive? My robot is the RosJet (or very like it.)