On my older truck, '37 the hole through the pitman arm and steering arms was shaped like a hour glass. It's not a true straight hole like you would think. The end is tapered out just like Denny's picture shows, that gives the metal a place to go when they peened the ends over and gives the ball stud its holding power.
Tapered end tie-rods will not fit with out being cut for the taper and tools are available for that from most dirt track, race car parts dealers. Speedway Motors sells the cutters.
Joe
