I had a badly stuck Suntour New Winner on a Campy NR hub. My realization of how badly stuck it was only came after two of the four prongs on the inner body were sheared off in successive attempts to remove it, not to mention destruction of two freewheel tools into the bargain. I gave not a rat's ass for the freewheel, they're a dime a dozen, but I wanted to save the hub, so I abandoned brutality with tools and stripped the freewheel down in place, leaving only the inner body. Then, very judiciously, using a high speed miniature grinder with a thin cutoff wheel, I cut into the inner body until it was weakened enough to split along the cut I had made, with a very modest application of torque via the freewheel tool.