My XX rear derailleur developed some slop between the p knuckle and outer cage due to wear in the cage spindle and retainer pin. To fix it I ground off the shoulder on the spindle, threaded the spindle to accept a 6mm nut(with nylon lock), rounded the nut to make it fit inside the knuckle with no resistance or slop, positioned the nut so there is no slop between the knuckle and cage and locktited it in place. I had to make flats on the spindle to cut the threads so I wasn't putting force on the carbon cage(not on the part that interfaces with the knuckle, close to the trough the retaining pin sets in). Will report how it works on the trail over time. Hope it saves a $$$ derailleur, nothing to lose....
Hopefully pics show repair well enough to make it clear. You can see the wear on the pin, sorry no pics of the shoulder before i ground it off.
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Thread: Fixed XX rear derailleur
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