Sorry to have to disillusion my fans, but I can remember having only one of those apart and it was a long time ago. I will try to share some very dim memories.
NOTE: Use these ideas at your own risk. I can't be responsible for any injury to a person following them, or to the gun.
With that said, I THINK it works like this. Drill a 1/16" hole through the guide about 1/2 inch in from the threads. Then, put the guide rod in from the front, so about 1/2 inch protrudes into the inside of the bolt. Push one end of the spring over the protruding guide and insert a suitable size pin into the hole you drilled, capturing one or two coils of the spring. The pin should be just long enough to catch the spring on both ends, but not long enough to keep the guide rod from turning. Now screw the guide rod into the spring by turning the rod with padded pliers. You might have to use a screwdriver to help compress the spring when you get about half way. When you get the spring on, use padded pliers on the front of the rod to pull the rod forward, then clamp it with padded lock pliers
Now, clamp the barrelled action in the vise with the barrel pointing upward. Set the buffers on the receiver. Insert the bolt, grab the rod again with pliers, and release the lock pliers. Make sure the threaded end of the rod goes through the buffers. Pull the bolt back (down) and using the padded pliers, screw the guide into the receiver.
I hope this helps, but scope it out before drilling that hole. As I say, it has been a long time (like 35 years) since I had one of those down. FWIW, the NRA disassembly book says the assembly can only be done with factory tools.
You might also make screwing the rod in a bit easier by cutting a slot in the outer end with a Dremel tool so you can use a screwdriver.
Jim
