to return the plunger 120 to the non depressed position in one embodiment as shown in fig2 d when the plunger 120 is depressed such that the reduced diameter section 131 aligns with the ball bearing 124 the ball bearing 124 no longer rests tightly against the bearing end 132 and thus may leave the notch 133 in the ball lock 125 allowing the outer leg to be rotated at this time to lock the outer leg the plunger 120 is released so that it returns to a non depressed condition as shown in fig2 c this allows plunger 120 to establish contact with the ball bearing 124 by transitioning from the reduced diameter section 131 to the beveled edge 143 and onto the bearing end 132 in one embodiment as shown in fig2 a and 2b limiting pins 127 are attached to the center swivel 111 and lie within the limiting grooves 135 of the ball lock 125 and serve to limit the range of motion of the outer legs as shown in fig5 a the outer leg 215 is hollow and allows inner leg 216 to axially slide within it in one embodiment of the invention the outer leg 215 is oval in shape and each inner leg 216.