Sounds like you do not have the acme threaded rods at all ? There are a couple of photos on my page that may help, otherwise let me know what details you need photographed.
It is fairly straightforward. There are two 5/8"-8 acme rods, and they screw into 2 nuts welded on the underside of the upper plate of the moving stage. There are bronze shoulder bushings in the top and bottom plates, the acme rods are turned down to ride in the bushings. The bottom of the shafts have two locking nuts, the top is secured by the belt drive pully. When the stage is leveled, the set screws for each pully are tightened to the acme rods to keep them in sync.
It did not come with a motor, although one was optional, my page shows the version I built. The standard method just has the two pullies linked by a toothed drive belt and a nut is on one of the shafts to turn with a wrench. The motor is far superior!