Prepare for the trick by pulling out the four aces and putting them on top of the deck.
Keep a "thumb break" between the top two aces and the bottom two aces. This "thumb break" is accomplished by holding the two cards ever so slightly separated from the rest by pressing the thumb against the edges of the cards.
Begin the trick by cutting the deck in half and putting the top half about 1 inch in front of the bottom half.
Carry the top two aces back with your hand when you return it to the cut pile. This leaves two aces on top of each pile. This step must be done quickly and can be covered by straightening the cards in the piles.
Cut the remaining two decks again and place the cut piles on either side of the other piles. This should be done at the same time, using both hands. The result should be a diamond shape of four card piles.
Perform the reveal by flipping the top two cards from the side decks over and putting them on the top of the first two piles. These will both be aces.
Flip over the next top cards from the side piles, and put them on their own piles. These will also be aces. Four aces should be showing, one on each pile.