Mine is a steel rod, at 25% back from the LE.  The second movable aft rod is about 3 inches back.  The bottom of the inverted "L" (picture an upside down L with two steel rods one is the pivot  and the back of the short leg is a screwed in steel rod.  This allows each side to be moved independent of the other.  My "L's" have an angle at the top for additional rigidness.

Here's a shot up the rear where you can see the control rods going forward down at the bottom.  Look closely and you can also see where the aft rod is threaded:



As you look across the stab and in the upper left the left aileron is visible.


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