I have modeled a simple padlock and am now trying to animate the process of twisting and closing the loop part of the lock. When blender interprets the path to close the lock, it takes the center of the bounding box of the loop and directly transposes it to the closed position. I want that the loop twists around the arm that is connected to the base of the padlock. How should I make this constraint. From the docs, the only way that seems to work is a constraint from the gaming engine. This seems like more than I need. I feel like I am missing something basic here.