There's your answer. Just read the posts. You now have three piles of cards dealt by the spectator onto the table, with the force cards on top of each pile (three, four, however many you want...within reason). If the backs are marked in a way only you will notice, you even know which card is which and all that remains is the reveal.

Hi there, I read all the posts, but in my case I have to force a card, do some stuff, force another card, produce a bunny, force another card and then handle the gorilla arm finale. So I was in doubt that the "three pile" thing would work across all that action. In other words, people might basically forget what the piles were for. If someone thinks that this method would be OK please let me know...

I was thinking maybe a cross cut force for the first card, then a fan force, then a glide force... something like that. I'm a little hesitant to do all the jumbo card handling in the middle of such a chaotic situation on stage. Anyone got a better idea?

In your routine, is it possible to force the three cards, one after another, as described above, and have three spectators slide the jumbo (force) cards into three separate envelopes without showing anyone what the cards are? Then they could hold onto the three envelopes until you want them to reveal to the audience which card they chose. And if that works for you, you could even use switching envelopes to exchange any three randomly chosen cards for the three force cards, but don't let the spectators peek at the cards until after the switch has been made.

Here's a strange observation. In my case, the cards have animal names stenciled on the face. So if you fan them you see nothing, it's all white. So the fan force with the top card moving underneath the face up fan is very deceptive. They touch a card but they all look the same, you just break the fan there, flip the stack over and they take their card...

Hindu force? or rough and smooth

After much experimentation I have adapted a version of the Slip Force for jumbo cards.

First hold the deck in your left hand by the bottom half, thumb on one side and fingers on the other. The bottom card will be facing your left palm.

Then use the palm of your right hand to bevel the cards, pushing them up from the bottom. I push the bevel up maybe three inches. Secretly pull the top card back down somewhat, that is the force card.

Next lay the jumbo deck long ways gripped in the cradle of your left hand. Your left thumb will run along the bottom card and long dimension of the deck, your left fingers will be touching the top force card. The bevel will be pointing away from your body and off to the right.

Use the right index finger to riffle through the cards until the spectator says stop. During this motion place the right thumb on the back of the top force card to prevent any accidents. Then pick off the top card stack with the right hand and drop the left hand and present the bottom stack to the spectator. Execute the slip force in the middle of this motion. Your left hand should just be able to turn palm up and present the stack of cards, you can move your left hand into a claw position to hold the loose stack.

This is a little strange in that the bottom card and riffled card are visible during the selection process, but very good in that (1) you are forcing the top card of the deck and (2) the selction process is clearly visible from stage and (3) the spectator is allowed to pick their selected card off the stack in a normal way.