As this is a "common" (as common as a frame failure is) location for cracks. I'll bet there are pro builders who have fixed these dozens of times, I've only replaced a few myself. But I don't weld so that tool is out for me.

Somewhat off topic is my breaking a front dropout back just after I left high school. Cracked across the section between the blade end and the wider slot portion. The blade ends had been done in an aggressive "milled " (as Paterek describes it) style and there was a tad of undercutting to the dropout surface IIRC. Additionally the frame had been chrome plated. Even still with what I now know about this stuff I remain surprised in my front dropout fracture and suspect the joint was cooked "well done" during brazing right from the beginning. Andy