Harley Davidson (1970 to 1978) Sportster XL/XLH/XLCH/XLT-1000. Service manual — page 4

REAMING FORK SLIDER BUSHINGS (1972 & EARLIER)
Figure 2-48 shows reamer with long pilot attached as required for reaming upper bushings to finish size. The long pilot is of correct size to fit into the unfinished lower bushing and guide the reamer through the upper bushing.