RE: Walkera Dragonfly #36
Just replace the aluminum ball links with Align stainless steel balls and links, and do not use any lube. It only makes the wear particles stick and make an abrasive paste. The only one that may not fit is the one on the bottom of the mixer arm to blade grip link. There is a close swing between the ball and flybar bushing arm.
Some silicone grease on the area where the washout base slides on the main shaft is good. But don't use anything except maybe graphite on the aluminum, and even that is a waste of time.
CH