Is it possible to use a thread to stop the rotation of a nut without locking the nut? For instance, I want a nut to rotate 90 degrees only. That's the easy part. But I want to be able to reverse the rotation without having to apply force to break the nut. In other words, I want to nut to rotation CW or CCW 90 degrees with locking. I'm unaware of a threaded solution and that makes sense as locking a nut is generally desirable and the purpose of a threaded nut. But perhaps there's a special thread of which I'm unaware. I achieve the action now with a pin a slot.