Going by the photos, There's no sign of a slot or an allenkey head, so to me they look like drift out pins, whether they are tapered or not?, you'll have to be cautious and go with the taper and not against it.
I'm wondering why you are pulling it to pieces ?, there are various products you can clean it up with, or sandblast it, take it right back to the metal, that's if it's not completely seized. (if it aint broke don't fix it)
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