I took a peice of round stock,chucked it in a lathe -turned it down to a nice fit in the torsion tube,,,it's about 20" long,,,I rounded the start end slightly...drive it in with a sledge hammer -staightens and makes the tube round...when your done ,take an old torsion bar insert it in the other end of the tube your straightening and drive the tool out..I've straightened dozens of chassis this way and if your already just an 1/8 out ..you've got it close already