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I would take a few minutes and grind off as much of the rivet heads as you can before attacking it with the chisel, just be sure not to grind into the control arms at all.
Either grind it or start with the air chisel, grinding before using the chisel actually is harder... You want the full rivet head so the chisel grabs it well... & you'll be chiseling/grinding into the balljoint not the control arm.... 
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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