Retractable leash for a swing car

A retractable leash for a swing car comprising:

• a front cover further comprising four threaded holes and an opening,
• a back cover further comprising four threaded holes and an opening,
• a recoil spring,
• a rotatable guide rail with a hollow cylindrical structure, and
• a rope with a free end;
• wherein the front cover and the back cover are a square shaped, wherein the four threaded holes in the front cover and the back cover are located near the four corners of the front cover and back cover, wherein a spindle is located in the center of the back cover wherein the spindle further comprising a receiving slot, wherein the distances from each threaded hole to the spindle are equal, wherein the threaded holes in the front cover and back cover correspond to each other, wherein the front cover and the back cover are conjoint by the thread holes and screws to enclose the recoil spring, rotatable guide rail, and the rope, wherein the recoil spring is disposed inside of the rotatable guide rail, wherein the recoil spring is removably connected to the back cover through the receiving slot, wherein the opening on the front cover and the back cover correspond to each other, and the free end of the rope extends out of the openings.