| pop the necks off, unscrew the truss rod nuts all the way out, lube the internal threads with wax and a little oil (not enough to get on the wood), then re-install, maybe using the trick of forcing the necks into back-bow before you screw the nut in tight.
you should get back to where you were, but with a less fear-inducing stiffness to the tightening.
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Walter Wright
Guitar Repair Gnome
Alpha Music, VA Beach
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