fixed mounting distance d from the first outer mounting hole 168 and from the second outer mounting hole 169 a second central mounting hole 176 is spaced the same mounting distance d from the third outer mounting hole 178 and the fourth outer mounting hole 179 the first central mounting hole 166 and the first outer mounting hole 168 define a first pair of mounting holes 170 a the first central mounting hole 166 and the second outer mounting hole 169 define a second pair 170 b of mounting holes the second central mounting hole 176 and the third outer mounting hole 178 define a third pair 170 c of mounting holes the second central mounting hole 176 and the fourth outer mounting hole 179 define a fourth pair 170 d of mounting holes fig6 illustrates a first blade 160 a and a second blade 160 b attached to the casing 32 of the housing 30 each of the blades 160 a b is attached to the casing 32 via the first pair 170 a in fig5 b of mounting holes by passing the first and second mounting rods 42 and 44 therethrough this orients the first shear edge 182 a of the first blade 160 a and the first shear edge 182 b of the second blade 160 b adjacent the cutting member 90 to cut a workpiece w because the mounting holes of each pair 170 are spaced from one another the same.