I made this dual action truss rod and soldered an allen head adjustment to it.
Tricky but enjoyable with left and right handed internal and external threads.
Getting a custom made, Chris Bozung, sloped shouldered mahogany and sitka dread made. Trying to get enough courage up to have him use this truss rod. Will put thin rubber latex tubing on one rod, if necessary, to prevent rattle. If member "Dreadnut" had soldered it, I wouldn't hesitate to use it.