I saw a "FREE" self working (I think) card effect on the Sankey Magic website but now can not find it..I will describe it as best as possible:

a spectator picks a card (a force I believe) the magician lays 4 indifferent cards, along with the chosen card, face down on a table..The magician places a paperclip on a rubber band and the clip moves over the cards and stops at the selected card...I understand the force, I understand how the clip moves and stops, but would love to see the performance video again just for a few other points..

Any help my magical friends can give me would be greatly appreciatly...Thanks, Cal...P.S. if you like you can PM me or just post the info here.