Any advise re: switching in the force numbers in an "Add-a-Number" or book test situation? (I'm not talking about forcing a slip of paper from a bag full, but a simple one-for-one switch of something written on a piece of paper or pad.)
I'm currently using a stack of business cards. Four different spectators write down 4 random numbers, then hand the stack back to me. I riffle to a short card, perform a (hopefully) invisible pass and go from there. The pass is not my concern. I just think a stack of business cards is easily dropped by spectators as it is being passed around. If that happens, there's no "out".
Common sense says that a small ever-day note pad is the most natural way of doing it, but after experimenting with a small spiral notepad with two "fronts", I'm not satisfied. If you close it, then re-open it, the angles are bad. If you DON'T close it, there's no way (that I've found, anyway)to switch to another page without a lot of fumbling.
I know there's a marketed switching pad that uses a magnet and a steel shim so the spectator can actually open the pad himself. But the leather wallet looks suspicious (to me). And the paper inside might also look "odd" to a spectator.
Ideas, please! Is there a method(or prop)out there that I've missed?