Awesome tear down instructions robo!
My 66 has the barrel that doesn't quite line up exactly at 11 12 and 1'o'clock although i have tried it without the pin in like you've said.. tho it was advice from someone else and i threaded the hole that u tighten to keep the barrel tight.
not good! tho i found a screw with an allen head thats longer and a nut to keep it tight
so that helped!
just wondered what fittings u used on your regulator btw? its a palmers rite?