Simply all you do is get the machine level with the 4 outer pads and then snug up the other 4. Just make sure to check the level after you have done this. The most important part really is to make sure it is cutting parallel. All you need to do is grab a scrap piece (3" dia. recommended) and run a cut of the diameter about 4"-6" long. Measure along the new diameter, if you are within .0005" you are doing good. If it is out by alot then you will have to square the head and that will be a whole different procedure. It doesn't really matter how level the machine is, it's more about the squareness of the cut.