Now take the ink bottle out, and the tip, but live the main part.Don't flush the ink that's left over. Now wrp the string around a neddle or something to stick it through the little hole, don't worry about the other side of string, tie the ink end of string to the cap as close to the pen a possible, cut any left over, put the pen cap on as tight as you can. You will get some ink on you but it's worth it, wait till the right time, when someone asks to use a pen give them that one, the cap will be so tight that they will need to pull real hard, then the cap comes off, the string is puller hard, the fire-cracker x-plods and out rushes a river of ink, yes it works, but it does take some time to set up. HAVE FUN