Hey,
I have an Eagle 50 and I really got tired of getting the "upgraded" part that has that little ball on it. So, I got a ball from my T-rex 450 spares kit, drilled a hole where the ball broke off, (make sure the drilled hole is slightly smaller then the screw, and screwd the ball in. Now, you have to use the larger link but it will thread on to the original link threads. Just work at it. I just broke a servo just by hitting the floor. I find these machines are pretty fragfile. My
t-rex is a bit more rugged. But I fly the E50 as it's a little cheaper to repair.......sometimes.

Hope this helps.