I think the simple answer is, what you are demonstrating there is a set of relative reference frames exactly as is seen in general relativity, its just einstein's lift idea but rather than "is the lift moving and the universe still, or is the lift still and the whole universe moving?" being the question its "Is the screw twisting and the casing stationary? Or is the casing moving and the screw stationary?". <br><br><br><br>Simply put, the guys who often end up thinking about that question in the 20th century were the ones who wanted to do crazy maths and answer world breaking questions about hugely macroscopic and microscopic events, not ones who wanted to make a cool lift.