a matter of design choice and may be varied to fit particular needs the suggested dimensions are therefore exemplary and reasonable variations are considered to be within the spirit and scope of the present invention suggested dimensions of the main bench unit 10 are as follows the shelving unit 2 is a three walled enclosure including two opposing side panels 24 secured to a back panel 22 the back panel 22 of shelving unit 2 is attached to the main bench unit 10 as shown by a pair of hasp assemblies 21 detailed in enlarge bubble illustration secured to opposing sides of the main bench unit 10 each hasp assembly 21 includes a hinged hasp 23 secured at one end to the back panel 22 of the shelving unit 2 the free end of each hasp 23 is defined by a slot which can be pivoted into position over a yoked bolt 27 bolt 27 being secured in the side wall 12 of main bench unit 10 a conventional bolt 29 is inserted downward through the yoke of bolt 27 and is anchored therein by a conventional tee nut to thereby secure shelving unit 2 to the main bench unit 10 the two opposing side panels 24 and back panel 22 of shelving unit 2 are of equal vertical dimensions and stand approximately six 6 feet to allow comprehensive assessment of lifting capability over a patient 39 s normal lifting range a mechanical fastener module 3 to be described more fully is secured to one side of the main bench unit 10 to allow convenient assessment of a patient 39 s manual dexterity while manipulating standard wrenches screw drivers and.