When assembling the saw I found that the table was warped and the extension wings were perfectly straight so that they would not match up along the mating surfaces. If I lined them up with straight edge front and back the middle was miss-matched 0.004 inches on left side and 0.006 inches on right side, both enough to catch a board or work piece sliding across the table. When I called tech support I was told that the tolerance for the table was 0.010 and that mine was within tolerance, and that I should line up the center and use clamps etc. to pull the front and back into alignment. Not possible as any attempt to do so would just pull the center out of position. I was able to Draw-file and block-sand the mating edges of the wings to match up so that work will not catch on edges and it will now work okay but not what I had in mind when I bought my expensive new saw! Also I found it next to impossible to start and tighten the mounting screws for the switch box using the 4 MM hex key so I removed the angle from the hex key and used a 4 mm socket on the shank of the key which worked perfectly. SN P2331303086