Friend dropped the controller, and looking inside, the right control stick assembly is busted.  The bearing has broken free of the plastic. and it will move right/left but not up/down.

Seems like this falls under the list of parts not typically sold separately unless someone is parting out a controller.  

Anyone know any sources for this piece?

TL;DR -- Looking for the bearings/plastic/encoders located in the controller, behind the right control stick.

Gonna be tough to find that.

Sorry to hear this. Please send it in for diagnosis and repair: http://www.dji.com/support.

@DJI Susan unfortunately the costs associated with contacting DJI directly out weigh the benefits.  Diagnosis isn't required, I'm certain which part is broken and that it is beyond repair.

Probably more cost effective to just buy a good used controller of ebay Brother Is there no way to make repairs with the parts superglue or epoxy repaired ?

Please consider purchasing a new remote or at least one that is used that you feel is in good condition. Rather then trying to manually fix,  you would save time and money in the long run.

ALABAMA Posted at 2017-9-17 04:30
Gonna be tough to find that.

Gonna be even tougher if you're searching for the wrong thing.

The mode switch is a toggle.  The right stick is not.