Semi-useful for shredding or making ribbons out of not-too-hard and not-too-soft foods. (Too soft, and it gets destroyed by cranking action, too hard and it won't cut - this is plastic, not metal). Attach knob using M3 screw and two nuts. Glue either "holder" onto end of crank after inserting thru pusher. Notch in disc lines up inside retainer ring. Screw ring onto body, insert pusher into body, apply pressure, and crank away. Tested with Japanese cucumber - made some nice curly strings out of it... see photo. More of an exercise than a real useful tool. But give it a shot.Warning! Use at your own risk! * Possibility of plastic coming loose into food unknown, so print in a color you will notice if it breaks off!* Food contamination risk unknown. * Injury risk unknown