is physically disposed inside vertical support 14 and fixedly coupled to spring mount 39 spring mount 39 is fixedly coupled to vertical support 14 at an upper end and disposed within vertical support 14 spring 40 is physically coupled to a lower spring pulley 48 at the bottom of spring 40 and upper spring pulley 46 is fixedly coupled to the top of vertical support 14 a cable 19 is physically attached to spring mount 39 on vertical support 14 is moveably attached to lower spring pulley 48 and upper spring pulley 46 and attached to support arm 11 when support arm 11 is move to a reset position spring 40 coils to provide tension force of about 15 pounds and up to about 100 pounds a foot pedal locking arm 58 is adapted to be in locking engagement with an arm support notch 60 support notch 60 is fixedly coupled to support arm 11 thus in the reset position foot pedal locking arm 58 holds support arm 11 in the reset position the locking arm spring 31 holds foot pedal locking arm 58 in the locked position a foot pedal cable 43 is physically coupled to foot pedal locking arm 58 and a foot pedal 27 foot pedal 27 is pivotally attached to foot pedal plate 62 and acts to extend cable 43 so as to unlock foot pedal locking arm 58 when foot pedal 27 abuts against a foot pedal cable stop 44 locking mechanism 23 is said to be in an unlock position when foot pedal 27 is depressed to foot pedal stop 44 although a tension force range of about 15 to 100 pounds has been selected in this embodiment any force.