blades 27 and spacers 30 however one skilled in the art will appreciate that yet other means may be employed turning of fig1 transverse rods 60 may be utilized to connect the blades 27 and spacers 30 in such a case each of the blades 27 and spacers 30 are drilled to provide holes 61 of sufficient diameter to receive the rods 60 the rods 60 define a leading end 63 and trailing end 64 the trailing end is fitted with an integrally formed head the leading end is preferably threaded for receipt of a nut or like reining member the rod 60 is passed through the holes 61 until the leading edge projects slightly from the blade segment 22 and the trailing edge is flush against the blade segment a nut or like member not shown is secured to the leading edge of the rod 60 to secure the blades 27 and spacers 30 one to the other of course as shown in fig1 a plurality of rods 60 could be utilized moreover rods 60 could be used in conjunction with the weld cords 40 and 41 once the disc 20 is so formed the central element 50 is secured within and to the inner circumference of the disc a plurality of configurations may be employed depending essentially on the configuration of the shaft of the refiner upon which the disc is being mounted for example a ring like structure with radial ears projecting into a central opening fig1 a a ring with holes fig1 b a ring with a single spoke including a central hole for fixing about the shaft fig1 c a ring with a plurality of.