Abstract: First and second plates have first and second elliptical apertures respectively. First and second carriage assemblies are adjacent to the first and second elliptical apertures. The first and second carriage assemblies have a common axis of rotation. First and second rails are within the first and second carriage assemblies respectively. Two first weights and two second weights are slidable along the first and second rails respectively. A first spring urges the two first weights outwardly into contact with the first elliptical aperture. A second spring urges the two second weights outwardly into contact with the second elliptical aperture. A differential mounted between the first and second plates has a first shaft rotating the first carriage assembly and first weights in a first direction. The differential has a second shaft rotating the second carriage assembly and second weights in a second direction opposite the first direction.

Abstract: A supplemental tongue is fabricated of a rigid material. The supplemental tongue has upper and lower ends. The supplemental tongue is positionable within a slot of a child car seat. The supplemental tongue has a recess. The recess is provided adjacent to the lower end. The recess has a lower linear edge. In this manner the supplemental tongue is retained within the slot. A wrist band is provided in a loop. The loop forms an opening for a wrist. The wrist band is coupled to the tongue.