respective sidebar sections 40 fig3 shows the separate molded parts that form the spreader according to the principles of the invention together with the manual controls for the shutoff plate the auxiliary shutoff plate 68 and the deflector plate 30 each of the molded sections that is the handle hopper assembly 12 and the base assembly 16 are molded by conventional molding techniques specifically by the technique known as rotational molding and more fully described in a booklet put out by the association of rotational molders oak brook ill 1993 entitled 34 rotational molding the introductory guide to designing rotationally molded plastic parts 34 as shown the handle hopper assembly is all one piece and includes three instrument panel areas 42 two of which are used for receiving the manual controls used with the invention a pair of arm support members 44 which transform into the hopper 14 itself opposing sidewalls 46 of the hopper 14 are seen to have an elongated recessed area 48 only one of which is shown that has on its face an elongated bracket 50 in the shape of a trapezoid whose side faces are sloped inwardly as they move from the plane of the outside face of the bracket to the plane of the recessed area 48 the base assembly 16 is seen to have two upstanding leg members 52 each of which are defined on the inside surface thereof with recessed.