The moron who sold me my all-aluminum-frame Cannondale 400 didn't have the stops adjusted on the rear derailleur. This moron, who rode the bike without checking it on the stand first, stuck the derailleur into the spokes, tore the derailleur apart, and snapped the aluminum derailleur mounting tab off of the dropout! Fortunately, the bike kept rolling and I wasn't in traffic. Lesson learned: CHECK THE BIKE BEFORE RIDING IT!
Questions are these:
1. Is it feasible to epoxy the bottom half of the derailleur mounting tab back onto the frame, chase the threads with a tap, and go to riding again?
2. Is it feasible to use a steel "derailleur mounting plate" after grinding off the remains of the existing tab? This would, obviously, move the rear of the chainline outboard by about 1/8", but it shouldn't matter that much. The bigger problem I see is that the steel mounting plate requires both a small "anchor" bolt and a bolt-on-axle sized wheel axle to keep it from shifting. Perhaps I could weld, glue, or rivit on the plate?
3. Is it feasible to TIG or MIG weld the remains of the existing aluminum tab back onto the bike and then recut the threads?
4. I understand Cannondale has a "trade up" program. Would this bike qualify in the shape it is in?