I have a copy of one titled "FLAME STRAIGHTENING TECHNOLOGY FOR WELDERS" by John P. Stewart. Published by: John P. Stewart 233 Dupras Avenue LaSalle, Quebec, Canada HBR 3S4 (514)-366-8410
Thanks TimGary. I`ll see if I can get my hands on a copy. I hope the information comes in handy for a project involving bending square tubing. Was told the original piece was done with heat and wet rags.