OK, Glenn, here you go.
Remove the little itty-bitty Allen set screw. Do not lose it!!!
Clamp the front end of the rifle, just behind the front sight, in a sturdy vise. It's very likely you won't be able to generate enough torque just holding the rifle in your hands, or between your knees. I have run across FS nuts that weren't even finger-tight, but that's the exception.
Using the FS pliers, unscrew the FS nut until it hits the front of the window in the FS in which the nut is seen. When the FS nut hits the front of the window, tap the FS forward until the rear of the window hits the back of the FS window. You must cushion the blow of your hammer with a wood block or somesuch. Do not struck the front sight itself, rather the base, as close to the FS body as possible.
When the FS has gone forward as far as it can, unscrew the nut until it once again hits the front of the window. Tap the FS forward. Repeat until the nut is completely disengaged from the threads on the barrel. By this time the FS is generally "loose" enough that it can be pulled forward off the barrel.
The FS is located by three slots in the barrel, which are engaged by three splines on the inside of the body of the FS, much as the rear ring of the M1 Garand's gas cylinder engages three slots on the barrel. The purpose of the FS nut is to keep the FS from sliding off the end of the barrel.
To replace the FS, hold the FS nut in the window as you slide the FS onto the barrel. At some point you will be able to engage the barrel threads with the FS nut. Tap the FS rearward until the front of the FS nut window stops on the front of the nut. Screw the nut further on until it hits the rear of the window. Tap the FS rearward again until it stops on the nut, then further tighten the nut. Repeat until the FS is fully seated on the barrel. There is a shoulder on the ID of the FS that will "stop" on the muzzle of the barrel. Continue tightening the FS nut until it is snug, then tighten the nut until one of the slots of the nut is on the top. You will be able to verify this position by ensuring that the slots adjacent to the top slot are symmetrically disposed on either side of the FS window. You will need the FS nut pliers to complete this tightening process. You want the nut tight, but not "gorilla tight"! You may need to restrain the FS at this point just as you did during the loosening procedure.
Replace the FS nut locking set screw. The tip of the screw will nestle down into the FS nut's slot. Be sure you are using a fresh, new, high-quality Allen wrench, engaging the set screw head in line with the screw. If you booger up the Allen recess in the set screw, there will be H*ll to pay getting the stub of the screw out, particularly because of the angle of the screw.
Remember that the FS slips on, it does not screw on. The FS nut screws on, but it should not be used to "pull" the FS rearward. Tap the FS. It's all too easy to strip the threads on the barrel if you try to use the nut to "draw" the FS rearward.
[Shameless Plug redux] This procedure is lavishly illustrated in the referenced book
, along with anything else you want to do to or for your rifle.[End Shamless Plug].
Does this help?
Walt