Some are non adjustable but most modern truss rods have a nut at one or both ends that adjusts its tension.
Graphite truss rod.
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Graphite bars are also available for an additional 60.
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The graphite rods don t have nuts on them just the truss rod.
Anybody who has an old modulus zon or musicman cutlass without a truss rod please comment on how straight the neck has stayed over the years.
I would tend to think that they build graphite necks alot less rigid these days so that a truss rod could actually move the neck.
If you really like the neck just put a washer in there it s a good solution.
Personally i don t need the weight or the added stability where i live the single rod necks are very stable so i have only one neck with double expanding truss rod.
The stiffening bars installed on either side of the truss rod in super bass necks enhance stability and add mass which helps to eliminate dead spots.