I use a blunt old wood chisel I dont care about to use a wedge and tap around the perimeter then move up to a big flat screwdriver and twist it evenly around the perimiter until pops off in perfect condition. Putting it back on I just wack it in the center with a rubber dead blow. The trick is to carefully use an actual wood chisel you know with like a knife edge end so it gets right in and cracks it at the start. Flat side on the hub. Then you can pretty much use whatever after its started.
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