Slip hitch tie cords all have a PVC swivel 2 foot from where the rooster's leg will be, to attach the 2' long hitch to the rest of the cord. Some (if you order it this way) also have metal swivels on the end which allow the cord to be attached to a stake or whatever and still swivel at that point.
These hitches now come in two sizes,
Generally speaking, the small size is for hard spurred stags or small legged cocks, large is for long spurred roosters or big legged cocks.
Click on the picture to enlarge.