It is usually not too hard to thread it back in.
Gibson truss rod nut.
Guitar truss rod wrench luthier tool for 8mm 5 16 gibson nut brand new 3 9 out of 5 stars 3 9 16 9.
Truss rods and truss rod nuts allparts uk.
Edited september 11 2019 by mihcmac.
16 futheda guitar truss rod wrench luthier screwdriver for taylor guitars silver 4 3 out of 5 stars 42.
They should have them wherever they sell gibson or aftermarket guitar parts.
Interestingly these nuts sit lower than the headstock facing so it looks like the damage occurred as the face of the headstock was being prepped to receive the overlaid facing.
You can use a 5 16 socket but i would recommend one of those gibson truss rod wrenches that looks like a little corn cob pipe but is usually black in color sometimes chrome.
Your guitar must be tuned to pitch using your preferred gauge of strings when you do this and under tension or it simply won t be correct.
The short taper leaves more metal for the hex sides which gives wrenches a good grip.
5 16 hex brass 5 16 length 10 32 thread.
The truss rod adjustment on a gibson les paul is done using its brass nut at the headstock end of the neck located under the truss rod cover funnily enough.
Gibson started using the long taper nuts in the 1950s and continues to use them today.
Gibson don t tend to mask the truss rod cavity terribly well before spraying so you can see that some of the nuts in these images have lacquer on them even over the ground away portion.
Sometimes the truss rod can be really stuck requiring you to use a small adjustable wrench to turn the hex wrench.