I recently got a CAAD9 frame for $150, and the only problem with it is that the downtube cable stop on the drive side is cracked. One response I got from a reputable frame builder in the area was:
"I don't think I can repair that. It really needs to be welded, and I'm not up for that fix without doing further damage to the frame. A different fix for it would be to file off the remaining nub of a stop, and rivet on a cable stop on the down tube. (That's how I run all my aluminum frames.)"
What do you guys think? Any advice would be very welcome.