you could try messaging doug directly. he might have some idea's being that its his baby. but anyways, i think it would be quite difficult to do it with more than 2 coins as the beauty of the effect is in its openess and clean display. its much harder to conceal more using the flicker hold. Ive attempted it with 2 and even that is pushing it. i do however really enjoy using it as a change, simply hold one coin in the left and as you do the reveal vanish the first and re-grip, it looks like it changes as it goes behing the finger. LOVE flicker