This is great for hecklers -- they will try to find marks on the cards but they will not be able to see them

the trick seems to have failed as the cap is still right there in the palm of your hand

The back cards bleed to the front of the court and numbered cards as well

however using a different approach

Little Door | Roddy McGhie Hilfsmittel This is great for hecklersFrom the creator of 'FLUX' and 'Sew On' comes the incredible 'Little Door' Effect: You tell the story of a trick a magician once showed you. You explain that he was able to name your chosen card using a little secret door in the card case. You illustrate this by drawing a little door on the card case. Without any funny moves, you proceed to OPEN the little door showing the card inside! Of course this was just a story so you close the door before