Hi. I bought a South Bend 9 lathe recently. It was missing some parts, but I'm slowly getting it working. In order to do some threading, I need to swap the stud gear on the reversing lever. This requires removing a nut. The nut is stuck. First, I tried to engage the gears and hold the chuck. It would not come loose. Of course, excessive torque was not applied, due to the risk of harming the gear teeth. The lever was removed, and it appears that there is no way to immobilize the other end of the shaft, since it is completely round. Again, holding the gears while attempting to remove the nut risks damaging the gears. I cannot understand what the engineers were thinking when they designed this. PB blaster first, then penetrating oil were tried. They didn't work. A torch was tried. It didn't work. What next? Is there a special trick to get this nut off? I can think of two ideas. First, carefully file two flats on the thin protrusion on the other side of the stud bushing. A wrench could then be used to immobilize it. Alternatively, a thin nut could be welded to the protrusion. I am more inclined to try the first, since it is less of a hack, but was hoping some restoration experts might know a better way. Thanks!