As soon as the replacement parts guitar arrived I unpacked it and got to work on things.
First order of business was to remove parts from the neck, and then loosen the trussrod nut, ensure it's viability, and treat it (oil) for reinstalling and tightening during reassembly and again after restringing. After the trussord viability was known, then cleaning the neck and fretboard and treating it them with replenishing oils was done.
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The trussrod nut was untouched by a wrench; Super clean, no wrench distortions. Good sign.
Here we see the trussrod nut removed after a short soak in drops of innocuous light penetrating oil on it's tip and rear race / bearing. Perfect; Came right off with no abnormal resistance at all.
The fuzzy white outline around the trussrod access cover placement, is a long history of polish wax and free-air dust accumulated there. But the accumulation of polish, wax and dust grime is good; The owner(s) played almost entirely open chords and thus likely to have made some meaningful boo-boos if they tried to "scrub" the guitar off. ~~~~~~~ And it did indeed take quite some careful scrubbing to remove all the polish wax and grime from this neck; Pictures of same provided on following pages.