Thanks for your infos. After some research I found out, that Amnesia does this with real physics, constrains and springs (I think we don’t have springs in UE). But using real physics like a physics handle is not an option since I have to detect how many full turns the valve does. I came up with a solition that centers the mouse cursor on interacting with the handle and then finds the look at rotation based on cursor position and viewport half-size. It’s not super elegant but it works since we don’t have a visible mouse cursor. Here is the Blueprint if anyone is interested. I leave the topic open. maybe someone has an even better solution to this since mine is just a hack 
Edit: here is the link to the infos on how it works in Amnesia: http://www.codingser.iblogger.org/2017/04/22/amnesia-interactable-door-and-valve-physics/
