See the attached instructions.
These steps explain it well. The bottom line is that you want the high and low stops to be determined by the adjustment screws on the pump, not by the limits of the spool's rotation or the cable/pedal travel. You can achieve this using this procedure or whatever other methods work for you, but once it's done you should end up with minimal slack in the cable and reach low idle and full throttle stops on the pump without the spool or cable interfering. Makes a notable difference in driving characteristics to have it set right.
Note that in step AX8 you want to adjust the position of the ball stud on the throttle arm, not the linkage rod's threaded adjustment.
May move this discussion to a new thread and out of the FS section if no problem for you.