Re: i saw this coming
Why? Fillet brazing is every bit as strong as arc welding with less chance of overheating the metal or blowing through a hole. Same with the tubing it's fine for this use. A solid chuck of "square rod' is going to add weight for not much strength gain plus being harder to drill. You've got the piece, braze it back in, why make it more work than necessary? These are sidepull brakes, they aren't known for having a tremendous amount of stopping force, especially in the rear install.