The video on the Y that is kind of far away is doing something weird with the camera...I think it has something to do with the cameras software...you can see it looks like the rack is moving but it isn't... probably just ignore that video...I didn't see the artifacts until after I posted it. The close up on the Y is a good video and that is showing the pinion moving laterally... Perhaps they are missing the roller bearings...like in Nate's videos of the upgrades to the drives. On the X axis when I pull in it too hard the spring compresses and the teeth start to slide out of the rack. I tried to balance how hard I was pulling so that I could see the movement without pulling it out of the rack. One of my biggest issues is zero time to spend...but I think these videos show me alot.