Is there an easy solution to replacing a water-bottle boss in aluminum frame? This is a Rockhopper frame, aluminum, and the downtube is sort of square and flat in the location of the boss.
The original boss broke loose. So now the kid I'm helping is stuck with about a 5/16ths-inch circular hole and no way to mount his bottle cage.
I might pull the bottom bracket and see whether I can thread a bolt through coming in from that way. I am just wondering whether there might be an easier, off-the-shelf fix.