How To Straighten A Bent Derailleur. Since its not recommended to try and straighten out the derailleur itself it means that you need to bend the derailleur hanger the way to fit with a bent derailleur. I would also recommend some thinner pieces of wood between the derailure and vise.

A vise is probably the best method. I know the feeling after adjusting a hanger. Fit the alignment tool.
It doesnt take much to bend a hanger.
It doesnt take much to bend a hanger. The Expensive Hanger Adjustment Tool. The bracket axle is unlikely to be bent but the B-link bracket itself can bend which will chuck it out of whack but the out-of-whackness will tend to be more. I show how to fix a bent derailleur hanger without expensive tools like Park Tools DAG-2 Derailleur Hanger Alignment Gauge.
