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“These control rod ends are identical with the Roban kit supplied ends. If your existing ends have been installed and removed multiple times (the plastic has gotten mangled), or you've got crash damage then these will fix you right up. They are for the 5mm diameter balls used on the 700/800 series heli kits.”
“I just replaced two pairs of these ball links on the cyclic push-pull control rods. I discovered that the original ball links had developed a slight slop which can cause intermittent axial wobble on my Roban 222 800 heli. The tolerances were very small and took a long time to troubleshoot the issue. Keep them tight but not too tight to cause binding.”