[larrys40]

Many of the sedans are tight . You will probably have to cut a section of the jump from inside to gain access. If done neatly you can put it back by methods of your choice. On wood bodies subrailed cars I would not loosen the body and lift up. You will be causing issues and stress you don’t want to deal with. If the threads can be repaired from below that’s probably the easiest method.

Larry shepard