I had a machine shop shorten my driveshaft. Cut a shoulder in one side and center bored the other to fit together the. They welded it up. I shorted my torque tube my self. I took all the material out of the straight part. I started by drawing a line down the tube. Then used my chop saw and cut it. I made sure I started the saw blade touching the line. So when I made the second cut I made sure if there was any angle on my cheap tool it would be the same. Then I chamfered the ends and clamped them of a big piece of angle iron making sure the line I drew lined up . Then welded it up. Hope that helps.