The replacement parts helped a tiny bit but the gears still do not interlock well. After a couple turns of the crank wheel, the gears no longer interlock and slip out of place. The desk only goes up a few inches and then the gears continue to slip out of place. 

The initial parts that came with desk were very mismatched - gears did not interlock at all and one of the legs was welded at about a 75 degree angle, so it didn't work at all. The replacement parts included a new leg but the gear on the leg does not fit well with the gears on the crossbar.