I used the shank of a number-size drill of the correct size to go in the hole and then used a brass punch against the shank to loosen the part. John's idea may be more controllable. I think it is important, no matter what you do, to have the pin a good fit in the hole though, so you don't chew up the edges of the hole.
What you really need, I suppose, is a pin wrench or whatever they're called. (A quarter circle of the correct radius to wrap around the part, with a pin at the end that hooks in the hole.)
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