Yes, with a file, rather than a nuclear proton guided intergalactic ultrasonic water jet.
Of course all those curlicues give the brazing more surface bite for strength, and more edge to see the brazing didn't leave any gaps, as well as pride in making something cool. I have a vision of an old man filing away, puffing his pipe, lazy old dog at his feet. Of course it was probably an indentured apprentice boy getting a slap upside the head for taking too long.
Chainstay it is, thanks V.
It's funny, I had this illustration on my desktop to add to the
bike thread, and never thought to look at it.