I pulled a pair of older Lionel F3's (18117) out of their boxes....and wasn't happy with what I found. I think a youngin went exploring! Anyways... outside of some loose screws, I have a torsion spring I haven't a clue as to where it goes. And I may be labeling the part incorrectly. It's one of those circular springs with two 'tabs': one sticking 90° straight out, the other 90° straight up.
Can someone point me to a illustrated parts diagram that might indicate where it belongs?