right pairs of compression springs 75 76 fig4 associated with the ends of the rolls are mounted on bolts 77 78 and secured in place by nuts 80 81 to urge flanges 82 83 of bearing assemblies 70 68 toward a mounting bracket 84 which is affixed to side wall 73 in fig5 7 the structure of roll 65 which will now be described in detail is shown roll 64 is identical to roll 65 fig5 shows roll 65 comprising shaft 42 on which a plurality of fluted segments 87 88 89 90 and 91 are mounted in fig6 shaft 42 is cut away to show a side elevation of segment 89 a section through which is shown in fig7 although all segments are shown as identical in this embodiment they could have varying lengths as will become apparent from the following description of the invention for example segments 87 88 90 and 91 could be interchangeable while the center segment 89 could vary in length to accommodate processor assemblies that adapt to cutterheads having different widths shaft 42 is threaded to receive holding nuts 92 and 93 segment 89 as in the case of each segment includes an integral hub section 93 with a machined bore 94 to receive shaft 42 at one end of bore 94 a beveled surface 95 is provided to receive a like beveled surface on holding nuts 92 and 93 in the preferred embodiment as shown in fig5 the hub on segment 87 is installed on shaft 42 with surface 95 facing the left to receive nut 92 and the hub on segment 91 is installed on shaft.