All, I recently acquired a 22.5" 1982 Trek 613 and when inspecting the headset was surprised to see an arraignment similar to a bottom bracket lug. I can see it as a time saver, no mitering required! Did this become popular with frame manufacturers or just a Trek thing? I've never cut up a production frame, but now I wonder in general how much precise mitering was done, even on frames with all real lugs.
Jim Sikking
San Antonio, TX USA