To use this launcher in left spin, twist the cap clockwise and pull. This should reveal a set of white prongs. Now, flip the launcher and place the cap on the blue/black prongs, and twist counter-clockwise to lock the launcher in left spin. To do right spin, just follow the directions backwords. WARNING: DO NOT PULL THE STRING WHEN THE CAP ISN'T ON EITHER SIDE, YOU COULD BREAK IT SEVERLY.