You mean .0005 right? Thats normal. Its going to move a little. Please try to post that video, and even a picture of the settings. Dont even look at the bearings until you check that all out. Im not saying that they might not need adjusted after some time, they are tapered rollers. But what I am seeing there is not anything to do with bearings. Please post that video if you can of it taking a cut, from as far back as you can so I can see the whole carriage and cutting tool.