Here is a picture of a tube being notched on the chassis. The JMR bother is great for that. In this case, we just found it easier to float this particular tube using temporary support tubes that we welded into place, then notching it afterwards. Setting the height, and keeping it level, and keeping it square to the rest of the chassis was difficult enough. Notching afterwards only meant that we didn't have to worry about the rotation and keeping the tube perfectly centered.