Buy a set of Jacobs Chuck removal wedges($10), use it like DannoXYZ suggests for the tire-iron " Wedge it in between the crankarm & fixed-cup". Works great, no damage. BTW, WD-40 is one of the least effective penetrating fluids, it is more of a water dispersing agent. PB blaster is much better, and the best is a home brew of 50% acetone and 50% transmission fluid.

Brian