I agree with dfariswheel.
I'm guessing the reason your sight fell off is because the pin's hole was too loose. If so a replacement pin might not fit any tighter.
A 1/16" drill bit (.0625") is the smallest commonly found & is just a tad larger than the factory pin. Use that drill bit to make a tight new clean hole then cut the shank off, to length, for the sight pin. Job done.
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