There’s no service procedures, no R&R guide, although it’d be nice. You just kinda have to know your way around these locomotives. You kinda jumped the gun ordering all new parts. I don’t think that’s necessary at this point yet. The top insulator has a hex pocket the nut sits in, and keeps it from spinning while tightening. Pretty sure the nut on your model hasn’t cinched down in the hex pocket and is still spinning on the inside and therefore you can’t get it locked down. This locomotive is formidable to take apart. My suggestion at this point would be to have this locomotive serviced by someone who’s well versed with this locomotive. They are not built in “traditional” modern methods, and more resemble a fine scale brass model. There are many layers to disassemble this engine.
Pat
