Francis references the cable stop design used by Cannondale and Klein, IIRC. The few times i dealt with this repair I was tentative about the design and repair process. Do your homework before blindly drilling holes in your frame.

In fact you might contact CoMotion long before you follow other solutions. A custom fabricated clamp that encircles the tube might be a more reversible solution.

Why did this happen? The most common cause of Alu. "braze ons" failure is a corrosive one. I have seem MANY top tube brake cable stops with much corrosion. I will try to remove as much of the white powder (AluOxide) as possible and coat the remaining with paint/lube to slow down the process. A few times the cable stop has significant shape loss. Andy.