motor 26 fig7 the flexible segment 92 of support 32 together with ball and socket joint 96 allows the mobile to be displaced laterally and then tilted until it is level the clamp 34 by which mobile 20 is mounted to a structure 36 is of conventional construction it includes upper and lower jaws 106 and 108 fixed together by a pivot pin 110 and a spring not shown for biasing jaws 106 and 108 toward each other jaws 106 and 108 are opened by pressing towards each other the handles 112 and 114 integral with jaws 106 and 108 this allows the jaws to embrace structure 36 also as shown in fig1 the lower end 115 of the tubular support component 90 is fixed to upper clamp jaw 106 providing supporting structure from member 36 through the clamp and vertical support to the hub 22 rotating arms 28 a 28 d and artifacts 30 a 30 d of mobile 20 spring motor 24 housed in motor battery compartment 46 is of conventional construction it includes a spiral spring 117 having an outer end 118 fixed by rivet 120 to the internal side wall 42 of mobile hub casing 38 the inner end 122 of the spring is fixed to an attachment 124 protruding from an actuator 126 the actuator mounted in the hub casing 38 for movement between upper spring motor engaged and lower electric motor engaged positions the spring 117 is wound by rotating a knob 130 at the upper end of.