Was there a captive nut for the derailleur hanger bolt?
Are you thinking of threading the frame or the dropout? I'd be worried about threading the frame if it's aluminium. I'd also be worried about countersinking it and losing too much material in which case you'll end up with a bolt head on the inside of the frame.
Was there a captive nut for the derailleur hanger bolt?
Are you thinking of threading the frame or the dropout? I'd be worried about threading the frame if it's aluminium. I'd also be worried about countersinking it and losing too much material in which case you'll end up with a bolt head on the inside of the frame.