Twisting device for twisting a winding head of a stator, comprising a holding device for holding a hollow cylindrical stator core having a first end face and a second end face being spaced apart to each other in longitudinal direction of the stator core, and an inner surface facing a longitudinal axis of the stator core with a least one slot on the inner surface extending between the first end face and the second end face having a slot depth in radial direction of the stator core, wherein at least a first conductor and a second conductor is positioned in the slot in radial direction of the stator core next to each other, wherein at least an end section of the conductors (26, 28) protrudes and/or extends over the first end face of the stator core, a winding core, having at least one cam protruding in radial direction of the winding core, arrangeable on the stator core and/or the first end face of the stator core in such a way that the cam is positioned next to the protruding end section in peripheral direction of the stator core, and a twisting tool having at least one slot for receiving a distal end of the end section of the first conductor facing away from the first end face for twisting the end section of the first conductor in peripheral direction of the stator core, wherein by twisting the end section of the first conductor in peripheral direction of the stator core, the end section of the first conductor is moved over the cam, bending and/or necking the end section of the first conductor radially outward in such a way, that a distance between the end section of the first conductor and the end section of the second conductor in radial direction of the stator core is at least partially enlarged with respect to the distance of the first and second conductor in radial direction of the stator core, which are arranged in the slot, wherein the cam comprises a sliding surface arranged and configured in such a way that by twisting the end section of the conductor to be twisted in peripheral direction of the stator core, the end section is at least partially moved over the sliding surface and thereby at least partially bent radially outward. a holding device for holding a hollow cylindrical stator core having a first end face and a second end face being spaced apart to each other in longitudinal direction of the stator core, and an inner surface facing a longitudinal axis of the stator core with a least one slot on the inner surface extending between the first end face and the second end face having a slot depth in radial direction of the stator core, wherein at least a first conductor and a second conductor is positioned in the slot in radial direction of the stator core next to each other, wherein at least an end section of the conductors (26, 28) protrudes and/or extends over the first end face of the stator core, a winding core, having at least one cam protruding in radial direction of the winding core, arrangeable on the stator core and/or the first end face of the stator core in such a way that the cam is positioned next to the protruding end section in peripheral direction of the stator core, and a twisting tool having at least one slot for receiving a distal end of the end section of the first conductor facing away from the first end face for twisting the end section of the first conductor in peripheral direction of the stator core, wherein by twisting the end section of the first conductor in peripheral direction of the stator core, the end section of the first conductor is moved over the cam, bending and/or necking the end section of the first conductor radially outward in such a way, that a distance between the end section of the first conductor and the end section of the second conductor in radial direction of the stator core is at least partially enlarged with respect to the distance of the first and second conductor in radial direction of the stator core, which are arranged in the slot, wherein the cam comprises a sliding surface arranged and configured in such a way that by twisting the end section of the conductor to be twisted in peripheral direction of the stator core, the end section is at least partially moved over the sliding surface and thereby at least partially bent radially outward.