Before installing the wheel with the replacement cassette, the derailleur needs cleaning. There's grease, dirt and sand on everything...
The red arrow is pointing to the main spring for the derailleur. It's almost completely coated with sand...
I used compressed air to blow off most of the sand.
The "jockey" wheels' teeth are worn and there's a ridge around the wheel.
Nearly done cleaning...
The red arrow points to a stop screw that is not sitting on the derailleur hanger tab that it's supposed to be sitting on... Misaligned...
Adjusted the screw out and now it's on the screw stop on the derailleur hanger...
Done cleaning.
Ready for the wheel.
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