I have a Kestrel 500SCi with a one-piece, non-replaceable derailleur hanger which snapped off suddenly as I was changing gears (not under a big load). I checked with Kestrel and was told they couldn't repair it. It would be a real shame to turn this frame into a single-speed and I can't spend the money to get an internal hub either.
Could I rivet on replaceable hanger with a similar profile onto the dropout? I'd probably need to rivet the hanger instead of using a bolt because there is little clearance between the inside face of the dropout and the cassette lockring. I would even consider using an adaptor claw except that the dropouts are horizontal. Thanks!!!