I received one of these as a gift. It took some effort to get it to work at all: The top handle would unscrew itself until I used a file to allow it to site deeper on the axle, allowing the connecting bolt to screw on for real. The handle knob unscrews itself when you crank. The grinding assembly at the core of the unit is held in place by screws which themselves are not solid in the wooden frame so if you aren't extremely careful it will come unstuck.
This seems like more of a novelty device than an actual kitchen tool. I wanted a hand grinder because I'm the only coffee drinker in the house, but it is just not worth the hassle.
