A long time ago I bought a rigid frame Matchless G80CSR basket case. It was time for me to upgrade. The frame was buggered up and it was an assortment of tubes held together by wrought steel or iron lugs. My father and I took it to Turlock and an old flattrack racer, his best friend, fixed it. There ware all sorts sweating, beer consumed, and cussing, and finally it was finished. A oxy-acetylene torch was used and there was no welding. A new tube was fitted into the lugs and the process looked like soldering, more or less, with brass. They said, in 1970 thereabouts, that this was a dying skill and people did not do it very often. They called it brazing.