BEFOREHAND take a spot card, a 7 for instance, and with a pin prick the card on the face just near the top index. This will raise a tiny lump on the back of the card which can be felt with the ball of the thumb as you deal the cards. Put this card seventh from the bottom of the pack. To present the trick, shuffle the cards as thoroughly as you are able without disturbing the bottom seven cards. It is easy to manage this with a riffle shuffle. Turn your back, put the cards behind you and have a card freely chosen from amongst those above the set card. Under cut about half the pack, have the card replaced and put the cut on top. Turn to the table, put the pack down and have a spectator cut it. Have your eyes covered with a blindfold and the pack handed to you. Deal the cards face downwards until you feel the little lump on the back of your key card, the 7. Put it aside face down, hand the pack to a spectator and tell him to turn over the card just put down. It is a 7. He deals cards to that number, finds his card is the seventh.