Nothing spectacular or complicated, I know. I just made a quick little fixture to hold the bracket to an angle plate, then centered up with the existing hole, nearly 0.050" oversize (and oblong). Once drilled out (31/64") and reamed to 0.500" I pressed in an Oilite bushing (AA-521-1).
The only thing left to do now is drill a hole at the top of the bracket for a small press-in flip-top oiler. After that, ream the bushing to size, and it's ready to go. That should keep this point well lubricated from now on.