Guess its more tolerant to the Amateur welding skills, that would burn up a lightweight tube set..

In 1975 I used Columbus Aelle, another brazing together a 1st frame, project, while friends burned holes in 531.


I started with a tubeset, lugs, dropouts & a BB shell, learned torch finesse in Jewelry making classes.

Another builder in town had built a tube miter cutting machine that was pedal powered, I 'had' to use.