Assume you have five cards in your right hand and that you are holding them in Biddle Grip. Your left thumb moves three cards, one at a time into the left palm. Each card goes on top of the previous card. You now turn the double in your right hand face up (using your right index finger to lever it over) and place it on top of the packet of three cards in the left hand. You turn the double face down and deal the top card to the table or on top of a packet already on the table.. You then repeat the process using the four remaining cards, the three remaining cards and, finally, the double card as one. I have seen this used in the context of a trick in which you are supposedly placing the four Kings on top of four separate packets.
Any help will be greatly appreciated.