I used to do this as a kid, it took months of practice but I got there in the end. The concept is taken from a book called 'Mind Motors You Can Build' written by a NASA astronaut back in the 1970's, don't know / can't remember which one. I just used plain paper balancing on a needle stuck in a cork. I could make it turn both ways but one way was rather weak. In the end I housed it under a glass bowl and put it on my shelf, I could make it move (slowly) from the other side of the room.