the centers of first angle ring 16 and second angle adjustment ring 18 and both surfaces 45 46 will intersect surfaces 45 46 to produce substantially parallel lines however second angle adjustment rim 18 has a greater internal diameter than the outer diameter of first angle rim 16 beveled surface 46 is suitable for slidable contact engagement of rounded second end 40 of cylinder wall 36 when cylinder wall 36 is tilted in the gyratory mode of operation described hereinbelow the distance between first angle rim 16 and second angle adjustment rim 18 is adjustable by suspending second angle adjustment rim 18 in a plurality of adjustment blocks 48 this embodiment of the present invention anticipates the use of three adjustment blocks 48 adjustment blocks 48 are mounted to housing wall 30 using a screw 50 placed through channel spaces 52 and jam nuts 51 and threading adjustment screw 50 into a mount 54 the plurality of adjustment blocks 48 may be raised or lowered on jam nuts 51 by threading screw 50 in and out of mount 54 screw 50 has a fine thread to provide for minute changes in the height of adjustment blocks 48 ensuring precise accuracy of tilt for cylinder mold 14 this adjustment means permits the present invention to accept cylinder molds which vary slightly in height.