[MrForbes]

that's a good point...although from the drawing, it's kind of difficult to figure out just what all the parts are, and how everything is supposed to be held together.

also it's not very difficult to use a die to put threads on the end of a round steel rod, rather than using threaded rod. One could even buy a long bolt, which has threads only on the last inch, cut the head off, and thread the cut off end with a die.