This is extremely uncommon with the new Pro ABS and Crop models as we have taken great pains to insure that the design does not allow misalignment. However, in a few rare cases it has been discovered that inferior screws in the stationary blade may actually push one end of the blade farther or closer to the green work surface, creating a crooked cut. In this case, you can usually fix the issue simply by changing the screws around. Move the middle two screws to the top and bottom positions THEN move the top and bottom screws to the middle. If a bad screw is at fault, having the top and bottom ends secured with good screws will keep the blade in correct position. We can also send you replacement screws if more than one screw is at fault. In the highly unlikely event we are unable to supply your goods within 7 days, we will advise of alternative options as soon as possible.