This grip offers the firmest and securest control of the deck and is required for the successful execution of certain techniques. Hermes Ostrich Birkin For Sale. To help prevent this, the left thumb lies on top of the deck, applying light but firm pressure. Gather the cards and turn them face down, holding the fleck in left-hand dealing position. Hermes Ostrich Birkin For Sale. As a rule, we would like to have positive lift when the helicopter is in the normal upright position, neutral lift when the rotor system passes through the vertical position and negative lift as the rotor system is inverted. For the sake of explanation, we will assume that the cards are palmed in your right hand. Hermes Ostrich Birkin For Sale. The thumb moves in an arc to the right and upward as the index, middle and ring fingers move to the left and downward, causing the cards to spread, forming the fan.