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I've done this a couple times. If the hammer isn't working, a lot of hardware stores carry these big coupling nuts that are 2" long or so. Get one of those and a bolt about the same length, center it on the hub from behind, brace it on the leaf spring holder, and use the coupling nut and bolt to press the assembly out.
Works every time, even on the insanely rusty. That's the only way I was able to replace these on my father's old 1996 Caravan with 300k+ kms on it. I don't even reach for the hammer first anymore, that's how well this works.