How To: Saginaw Power Steering Pump Rebuild

Ok can someone tell me if my TRW pump is a press on pulley? Looks like it but it has a large hex area at face of pulley?
Thanks.
67 273 cuda if that matters.

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Yes, it's a press on...
The large groove on the hub of the pulley is where the 2 halves of the puller go around it to pull it off.
Down inside that hex is threads too....they're used with the tool to press it back on.

Jeff