I have two sram xo derailleur
Both are broken, but together can make one good derailleur.
One derailleur has a broken parallelogram spring but everything else is fine.
The second has the cage/pulley assembly broken off.
I was going to take the parallelogram spring off the second to fix the first but never got around it.
With a little work you could have yourself a good xo derailleur for really cheap!
$45 obo
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Location: Flagstaff