The fold overs can be painful to remove.
I used a very small ball burr and a high speed grinder to get to the inside of the bend (in the rubber section). This weakened the tab so that it folded inward easily.
I noticed that my tabs weren't just flat punched but looked like slits were made into the bushings.
I don't think slits were actually pre-made, but the machine that originally pressed the folds into the metal produced enough force for the metal in both pieces to split.
So I cut some slits with a dremel and this worked pretty well. It did require a lot of pre-measuring.
Next time I'll try John's method!