Shorty: Lever-Action Irons RA
Re-posting this one for a friend who was asking about it. Ball-shaped and lever-style key-in-knob irons are pretty easy using just a standard set of irons and a set of key-tools.
And....once again....before commenting that "you wouldn't do that on a fire", stop and think about it. No one said you should. Most thru-the-lock methods are not intended for use at working fires.