the multi - purpose tool of the present invention in its preferred form here specifically disclosed comprises four elements individually shown in fig1 . the first element , generally designated a , is designed to engage the front seat of a vehicle and to support the remainder of the tool in operative position . it is preferably in the form of an elongated relatively rigid plate 2 one end 4 of which is slightly inclined relative to the remainder of the plate 2 , the latter being provided opposite the end 4 with an aperture 6 . the second element , generally designated b , is designed to be adjustably associated with the element a . it comprises an elongated rod 8 sized to pass through the aperture 6 with some clearance , so that when the rod 8 is perpendicular to the plate 2 it can slide freely through the aperture 6 , but when it is inclined relative thereto , as shown in fig3 and 5 , it engages the edges of the aperture 6 and is retained in position thereby . at the end of the rod 8 opposite from the end which passes through the aperture 6 is an enlarged cylindrical portion 10 defining a socket 12 open at its extended end . the third element c is designed to be used to engage and position either the accelerator pedal 14 or the brake pedal 16 of the vehicle ( or the clutch pedal , if present ). it is in two parts generally designated 18 and 20 respectively . the part 18 comprises an externally threaded portion 22 at one end , a rod - like portion 24 at its other end , and an enlarged portion 26 between the portions 22 and 24 . the part 20 is in the form of a rod with an inwardly extending internally threaded socket 28 at one end into which the portion 22 of part 18 is threadedly received . at the other end of the rod 20 is a pedal - engaging part generally designated 30 and here shown in the form of a fork 32 pivotally mounted at 34 on the end of the rod 20 . the fourth element d comprises a rod 36 which at one end preferably carries a fork 38 designed to engage the rim of a steering wheel . its other end is constituted by a rod 40 adapted to be received in the socket 12 of the element b . fig2 and 3 illustrate how the tool of the present invention can be used to accurately position an accelerator pedal 14 or brake pedal 16 ( or the clutch pedal , if present ). the element a is positioned vertically against the front edge of the front seat 36 of the vehicle with the inclined portion 4 of the plate 2 being oriented downwardly and with the aperture 6 of the plate 2 being located above the upper surface of the seat 36 . the rod 8 of the element b is passed through the aperture 6 , to desired degree , extends over the upper surface of the seat 36 , and is oriented toward the pedal 14 or 16 while being oriented in a non - perpendicular position relative to the plate 2 , thus retaining the elements a and b in relative position . the element c is then associated with the element b by passing the part 24 of the element c into the socket 12 of the element b and by hooking the hooks 32 over the top of the accelerator pedal 14 . as has been pointed out , positioning of the element b and hence the element c is accomplished by sliding the rod 8 through the aperture 6 to the desired degree while the rod 8 is generally perpendicular to the plate 2 , the orientation of the element a to the element b to permit that adjustment being readily accomplished by grasping and appropriately moving the inclined portion 4 of the plate 2 . thereafter the precise positioning of the accelerator pedal 14 is accomplished by grasping the enlarged portion 26 of the part 18 and rotating it in one direction or the other so as to extend or shorten the overall length of the element and thus appropriately position the accelerator pedal 14 . rotation of the element 18 is facilitated when the enlarged portion 26 is rendered readily graspable , as by being knurled or , as here specifically disclosed , being provided with flats . length adjustment of the tool by changing the relative positions of the elements a and b facilitates gross length control and rotation of the part 18 relative to the part 20 produces precision length control by utilizing threading of appropriate precision . this description also applies to use of the tool for positioning the brake pedal 16 ( or clutch pedal , if present ). when it is required that the steering wheel of the vehicle be retained in a particular position the steering wheel , such as that shown in fig4 and identified by the number 42 , is turned to the position appropriate to the particular operation being performed . the elements a and b are associated with one another , but this time the element a is generally horizontal , with the plate 2 located on the upper surface of the front seat 36 , with its inclined portion 4 extending somewhat upwardly away from the seat . the element b extends generally upwardly from the element a with its socket 12 open at its upper end . the element d is connected to the element b by sliding the rod 42 into the socket 12 . since the hooks 38 of the element d extend upwardly , one way that the tool can be placed in its steering - wheel - engaging condition is by assembling the elements b and d , vertically positioning the assembly so that the hooks 38 engage the steering wheel 40 , sliding the element a up along the rod 8 while the element a is swung out of the way of the vehicle seat 36 until the element a is slightly above the upper surface of the seat , then swinging the element a to overlie the seat 36 , making final adjustments of the rod 8 with respect to the flat plate 2 to ensure firm engagement of the hooks 38 with the steering wheel 40 , and then inclining the flat plate 2 relative to the rod 8 while the flat plate 2 rests on the upper surface of the seat 36 , thereby to hold all of the parts in position . from this it will be appreciated that the tool of the present invention is made up of relatively simple and inexpensive parts to constitute a single multi - purpose tool readily and accurately useable by the technicians to perform a variety of adjustment procedures , thus taking the place of an equal plurality of individual tools while providing for more accurate and readily achievable control than has been possible heretofore with the individual tools . while only a single embodiment of the present invention has been here disclosed it will be apparent that many variations may be made in the details thereof , all within the scope of the instant invention as defined in the following claims .