Rawlings Pro Line Two Wheel Owner's Manual page 6

Figure 3: Ball feed tube and transport wheel installation
can quickly and precisely locate each of the wheels. See Figures 4 and 5
for the typical positioning for real baseballs and softballs. For baseball,
the blocks are in the center position, with 5 empty notches on each side
of the block. For softball, the blocks are located at the outermost position,
Rawlings Pitching Machines
Rawlings Pitching Machines