Sam, you really want a rectangular cross-section for what you use in necks. Round has a lot more natural flex to it. That said, if you make the slot rectangular and bury two rods one on top of another in epoxy, both sides of the truss rod slot, that could work. You could do one each side, but two would be better for stiffness.
Don Williams39091.5636921296
_________________ "I want to know what kind of pickups Vince Gill uses in his Tele, because if I had those, as good of a player as I am, I'm sure I could make it sound like that. Only badly."
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