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We sand the neck until it is dead flat again and to the correct radius.
We now fit a set of strings back on and tune to pitch.
Set the truss rod so the neck is dead flat.
For info on truss rods and how they work
Attached Link
Refit the guitar to the neck jig, remove strings and carry out a fret level.
I remove the guitar after being fret levelled from the neck jig, and crown the frets on the bench as per normal fretting process.
Carry out a setup, dial in some relief at the 7th fret and job finished.
Perfectly straight and super low action.
Using some pencil lines for reference, we mark out the fretboard.
After 10 passes with 220 grit, we have some red circled areas which have not been sanded, this shows how much twist is occuring on this neck under tension
The guitar is removed from the jig for convenience and frets are fitted as per traditional refret process
Do not level the fitted frets yet.
Attached link.
Having set the guitar up, we remove the strings, adjust the tension on the headstock, which twists the neck into a simulated string position.