you mean the threads are rusted and seized or the ball end has jammed up? Either way you can soak them in penatrating fluid over night and see if they un seize. Also I used a propane torch to heat the threads up then stuck them in cold water and they came loose...Used a vice to hold the rod.
The ends were seized to the rod, we froze them and finally broke them loose. There is no movement in the spherical ball. Metric is a no no where I live in the bearing supply houses. I have a a new billet rod and just need to find the ends.
Moto do you sell just the ends?