A little food for thought, below is a No.4 Mk.2 that was “regulated” or accurized by Fultons of Bisley, the trigger guard bushing was totally removed and not used.
(It was not needed)
Why would they hog out the area where the bolt goes through ? Although it May not be needed. I think I will replace the sleeve. I looked all over town today, but no luck. I have a piece of 7/16" pipe and don't have a lathe. I am going to try and improvise and stick it in my drill press and either file it or sand it with Emery cloth. Not that much to remove. How long are they supposed to be ? I seem to remember 1/2" Great pictures Ed

One other thing, if the spacer sleeve isn't needed, is it necessary the bed the trigger guard ?
Got to go
The trigger guard hinges at the rear trigger guard screw and when the front trigger guard screw is tightened the trigger guard acts like a clamp to tightly hold the fore stock in place.
An armourer inspected the bushing length during the yearly teardown inspection, REPETE an armourer checked for proper bushing length once per year.
Take the Enfield from damp England to the desert of North Africa and the bushing will end up too long. Get the stock soaked in the rain and the bushing will be too short.
A friend at work shot in .22 silhouette competition and loosened his bedding screw after each match and re-torqued this screw before each match on his Anschutz target rifle.
Bedding pressure is far more important than bushing length on a wooden stock because just a simple humidity change can change bedding pressures by causing the wood to swell.
The Enfield in my photo was used to shoot out to 1000 yards where humidity could effect the Point of Impact of the bullet.
Photo below shows wood crush, please note the wood crush at the bottom of the receiver is NOT equal, while the bottom area of the trigger guard has MORE wood crush and is equal on both sides.
Now go back up and look at the bedding foot print on the accurized Enfield in my photo and see how even the receiver is bedded.
A stock collar (bushing) gauge and filing jig is used to determine the proper bushing height, it is then shortened an additional .010 to allow for slight wood crush.
Below a new bushing in the filling jig end of the gauge.
(please note a new bushing is much longer than ½ of an inch which is just a “WAG” or wild ass guess)
Taking off the last .010 of an inch with a fine file.