the user to conveniently remove the work surface without requiring any specialized tools in most cases a strong upward pull on the work surface will result in disengagement when piston 101 includes a camming surface to cause disengagement of the piston as the work surface is urged upwardly with this arrangement the work surface may be reversed if desired to define the opposite transition or a new work surface may be secured the engaging ribs 102 provided at either edge or close to the edge of the work surfaces 40 can also be used to receive accessories such as the hydraulic adjustment arrangement 106 shown in fig1 this hydraulic adjustment arrangement also includes a spring detente arrangement 102 at either end thereof which can be used for securing of this adjustment arrangement beneath the work support surface the hydraulic adjustment arrangement 106 includes a hydraulic fluid tube 108 connected to the hydraulic cylinder 110 having displaceable piston 112 the hydraulic cylinder and piston are connected between telescopic leg sections of the central support of work surface 40c with this arrangement the inner telescopic section 114 of the leg arrangement 113 telescopes within the lower telescopic section 116 lower telescopic section 116 is secured by bracket member 118 to the base 120 the hydraulic adjustment arrangement 106 may be secured to the work surface 40 shown in fig5 and allows the user to adjust the height of the work surface 40c when operating the hydraulic adjustment arrangement 106 secured beneath work surface 40 this is particularly useful with respect to a monitor stand which can be.