I still have a problem after tried what you said. My KSP version is 1.05, with all mods up-to-date with CKAN. please help me to find out what the problem is? As the Video depicts, I've attached the "anchor node"of the rotor (which is facing down the VAB) to the Command Pod, but still behave weird when rotating this part by servo. I also tried many ways to mount my rotor but all failed. if I use stock Magic Smoke Robotics Parts, everything is just fine.