interact to set a desired tension in the illustrated embodiment the cable 50 includes a first end portion 70 having to set a desired tension a first bearing member 72 attached thereto using any suitable means including swaging the first bearing member 72 has a broadened portion 76 to define a shoulder 78 that bears on an internal shoulder 80 of the first arm segment 46 see fig6 and 7 the cable 50 also preferably includes a second end portion 84 onto which a stud 86 is joined by any suitable means including swaging the stud 86 can include wrench flats 88 for turning or holding with a wrench or preferably a slot through which a screw driver or other device is inserted for holding the piece securely and threads 90 that are used to connect and adjust the cable 50 to the tensioning mechanism 54 the tensioning mechanism 54 could be at either end of the breakaway assembly 38 but for space considerations it is preferred to be joined to the second arm segment 48 or at least at the distal end of the breakaway assembly 38 in the illustrated embodiment the second end portion 84 of the cable 50 extends through a tensioning element 52 and is joined to the tensioning mechanism 54 the tensioning element 52 is preferably a compression spring but it can be.