As far as the CA ball joint, I've heard of several successful tries and it works. But, in my experience it was better to not run the risk and just cut the plastic balls off and install metal ones. They're easy and cheap. As far as the link arm, well I would just buy new ones because I hate when I lose a chopper to mechanical failure [] I found one problem with that Dragonfly 36. The battery just would not get a good charge so I left it on for a lot longer than I was supposed to and then it got hot, which is what I wanted to see. It flew rather well after I got some tail authority back but that battery's flight time pretty much sucks. Thanks guys for all your inputs...helps with the brain storming.