If you have a knob with two ball bearings in its center with a shaft running through them, and that shaft is connected via a hinge to another shaft which is held in some position but not free to rotate, then you can rotate the second shaft by changing the plane in which the knob is without changing the angle at which the hinge is bent. This is easy to do with your hand; the movement is the same as that used to spin a Powerball gyroscope. The knob functions as a swashplate through which you can turn the second shaft with an adjustable mechanical advantage, which can be arbitrarily small when the angle between the shafts is arbitrarily small, and can go up to the diameter ratio between the second shaft and the knob.
This amounts to a new kind of screwdriver, which allows you to unscrew screws arbitrarily fast without a motor. It does need some way of being held in the screw.
I thought this might work especially well using a ball-end hex wrench, with the second shaft being the screw itself, but I don't think that works.