I recently picked up another well loved GT road bike frame- it's in great shape aside from a missing downtube cable stop. The model is a ZR 4000 probably from 1999, it's 7005 heat treated aluminum. My best guess is that the cable stop was originally glued or bonded to the frame somehow based on a lack TIG weld lines or braze. I'm not sure if the cable stop snapped off from poor storage or when the frame was in use last. It's a CL find and lived in a garage for a number of years.
What's the best way to reattach a new downtube stop? Would I have a stronger bond if the new cable stop was aluminum or plastic? I have a great work space with appropriate ventilation and equipment, but after preliminary research I've found a lot of aluminum specific products (like those used on airplanes) can't be purchased online or by individuals, so whatever product needs to be accessible in that regard.
I'm also open to non-adhesive/epoxy solutions, but the tubing is ovalized and very oversized, so using downtube shifter clamps doesn't seem feasible. As a last resort, would using a hose clamp be safe on ovalized, aluminum tubing once I got it tight enough to withstand the forces of shifting? As a last, last resort, I am prepared to run cable housing all the way from the brifter to the cable guides under the bottom bracket. I'd like a pretty bike, but ultimately this one is just for riding and not show.