Truss rods....
The rods, as well as the anchors, are made from high carbon drill rod. The adjustment screw is made from 12L14 steel. The screw should strip before the rod itself. That way you can easily change it out if any problems "happen"!
Tap and die...
Standard stuff. The thread on the rod and anchor end is 10-32
Threading the end...
The anchor end is only threaded for about 5/16 of an inch. The adjustment side is threaded about 1 inch.
Tapping the anchor and adjustment screw...