I thought almost immediately that it makes sense, but I suspect my reasoning is wrong or partially correct at best. <br><br>In my mind rotating the cylinder or rotating the screw is the same, because the friction and pressure (and the vector of force?) is the same. Maybe we feel this is counterintuitive because rotating the screw is just more simple and so we've hadn't even thought doing it the other way. <br><br>Videos like this are so amazing, makes you think and thinking is good for you.