How do I make just the flat birthday card, with the flat paper coins that can still slide in the open slot of the card, & as the paper coin slide down the (flat) hollow passage ins... moreHow do I make just the flat birthday card, with the flat paper coins that can still slide in the open slot of the card, & as the paper coin slide down the (flat) hollow passage inside the card would do something or would drop down a paper item from the bottom when the certain lower point is touch from the paper coin that's in it?