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I show how to fix a bent derailleur hanger without expensive tools like Park Tool’s DAG-2 Derailleur Hanger Alignment Gauge. This repair is meant for steel frames with integrated hangers. If you have a replaceable hanger, I recommend you just replace it. Do not attempt to straighten the hanger using the derailleur. You will likely bend the derailleur and then have a bent hanger and derailleur. You do this at your own risk.

How To Make A Derailleur Hanger Alignment Gauge Tool: