Hi, guys

First of all - thank you very much for your help, but I don't quite manage to do those things. First of all I changed parent of the prop to the universe - I didn't find a way to really unparent it completely from everything, how do I do that?

After that I tried to change the position of the origin with the joint editor, like you told me. But whatever I do, moving the center moves the prop with, so the relative position of the origin and the prop remains the same. I think I do something wrong, but I can't figure out what :(