Graphite bars are also available for an additional 60.
Graphite truss rod.
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Some are non adjustable but most modern truss rods have a nut at one or both ends that adjusts its tension.
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.
If you really like the neck just put a washer in there it s a good solution.
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.
Both the double expanding truss rods and the graphite rods will affect tone bad or worse is subjective.
The graphite rods don t have nuts on them just the truss rod.
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.