Am looking for a way to square the outside of a 2"x 2" aluminum tube w/ 1/4" walls by 4" long, so that the outside is square to the inside walls. does any one have an idea how I might achieve this? my plan is to do hundreds of these over time.... as it is a common extrusion with square corners purchased in 20' lengths I would like to find some setup that would work. I have a PM45-CNC mill 9X32... any suggestions would be considered. thanks