12v Starter Solenoid in a 6v car.

[squirebill]

My parts book shows two nuts on that stud.....one locks the stud to the starter housing, then the cable terminal is put on the stud and then another lock washer and another nut to secure the cable terminal.  Sounds like you need another nut (5/16-18) and a 5/16 lock washer.  I don't think the stud can fall into the starter...it may go in a little until it hits the armature assembly.  Regards 

[SteveR]

10 hours ago, OUTFXD said:

I'm concrned that if I pull the terminal that the bolt on the other will drop into the starter.  Is it held into place somehow?

If the bolt is loose you will see it turn when tightening the nut. If it does drop in, well you were going to take the starter apart anyways.

[OUTFXD]

I think I figured out the riddle of the self loosening starter terminal.