carried on end plate 18 and a drive shaft 98 projects through the end plate 18 to support driving gear 100 the driven gear 86 on stub shaft 82 is supported by bearing race 90 to interengage with driving gear 100 as apparent from fig3 the bearing support for bearing race 90 comprises a pair of v disposed blocks 102 and 104 one of the blocks 102 is fixedly carried on end plate 18 while the other block is pivotally secured thereto by pin 106 with its lower end 108 resting on adjustment means in the form of machine screw 110 that is threadably mounted in abutment block 112 advance or retraction of the machine screw 110 in the abutment block 112 thus permits a variable adjustability in the vertical position of bearing race 90 between the blocks 102 and 104 permitting the interchange of cylinders 12 14 and 16 while avoiding any vertical loading on driving gear 100 fig4 illustrates the relaxed contour which is assumed by the assembly of the flexible make ready sheet 56 and the adhesively mounted printing die mats 62 44 and 58 when the assembly is mounted on cylindrical work support member such as provided by the invention this naturally bowed contour to the assembly greatly facilitates the mounting of the assembly on the drums and rollers of the printing apparatus as well as insures that the edges of the relatively stiff printing die mats do not separate and project into the plane of the printing die characters or relief portions the invention has been described with reference to the presently preferred and illustrated embodiment thereof it is not intended that the invention be unduly limited by this description of the preferred embodiment instead it is intended that the invention.