Sounds like its in gear. I think the prop should spin in either direction when in neutral. To get the nut off put the wrench on and put a chunk of 2X4 between the prop and the cav plate that will hold it from turning. If the shaft spins with the nut and the prop isn't moving, the hub is spun. Ive seen them burn them out with a torch (messy). there is probably a better way.
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