Mine came off easily... there is nothing there that retains the nut unless it was staked on after assembly... inspect the end of the shaft where it meets the nut and see if there are any punch marks.
I agree with 682, should just loosen as there should be no need for massive torque, spray with penetrating fluid, then then apply light heat, then find a way to bind the shaft to prevent it from turning.
I'm halfway into a similar project. Does anyone know of a way to add a clutch or shear pin between the lead screw and gear box?? I doubt I'll make the same mistake again, but there's probably other ways to crunch the gears, and having a "fusible link" seems like cheap insurance.
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