I noticed the derailleur seemed to be sitting at different angle than the cogs on the cassette. Looking closer, it looked like the derailleur hanger was bent. So I used my Park Tool DAG 2.2 Derailleur Hanger Alignment Gauge to straighten the hanger. I show the process.
The Park Tool DAG 2.2 is a really nice tool, but it is kind of expensive. So I have a video shwoing how to make a cheaper home made version of of the tool here - How To Make A Derailleur Hanger Alignment Gauge Tool: • How To Make A Derailleur Hanger Align...
But if you want, the Park Tool DAG 2.2 is here:
https://www.amazon.com/exec/obidos/AS...
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