chopper

Hold between forefinger and thumb, it is important to have dry hands for this, baby powder works well if hands are moist.
position it between finger & thumb with the folds facing towards the front, stand in the middle of a room and with a gentle speed turn in a circular movement while holding chopper at full extension of the arm letting go with you,re thumb, if its been built to spec, it should start rotating perfectly while remaining on the tip of ones finger have fun :)