
So. Choices.
1/ Try and find a socket that actually fits the fucking nut, thanks Adrian, its not metric. Oh and its brass as well so its a pig to try and remove without being able to get an actual socket onto it - the groove is way to shallow.
2/ Saying fuck it, heating up the fingerboard, removing, fixing the truss rod slot properly and fitting a double acting one, regluing the fretboard ( or a new one )
3/ Saying fuck it, consigning it to the pile of maybe one day I'll get round to it and re-using all hardware in a new build.
Option 3 is currently my favourite. But 2 is an option as maybe I want to do more luthiery work in the future. Option 4 would be just to ignore it like I have for probably a year or three now.