I took the new part and clamped the 1/4" metal end at the upper corner/edge of the bench vise, with some of the round above the jaw of the vice.
I filed a small flat spot on the 1/4" round and drilled a 1/16th" hole across the diameter, slightly less then 1/16th" from the end.
The 1/16th x 1/2" cotter pin used as the retainer cost seven cents.
The last two times I did this repair I peened the rivet. The cotter pin is the easiest by far.