In this one the tertiary rod is square and is made of two different diameters of squarestock that telescope into one another. I don’t remember if this rod is adjustable. Seems to me that it would be if a person bothered to design it this way. Probably a set screw or a pin.

In this photo, the rod is lying entirely on top of the tongue and has a leather strap at the end to buckle to the halter. The metal rod jutting up from the vicinity of the leather strap and leaning to the left is not part of the tertiary rod. I don’t know what it’s for. Perhaps to hold the leather strap to keep the rod in place when not in use.

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