PS: I am not responsible for anything you do with this. Don't do bad stuff.
Step 1: Materials:
-thick steel wire (or small nail)
Step 2: Step1:
Cut a rectangle about 1/2" by 1" from paper and roll it into a cylinder with a diamiter about equal to the width of the paper cap. Tape it in this position.
Set the rolled up paper on the cap so that one of the ends is on the cap and fold the tape that the cap is resting on up onto the sides of the rolled up paper. Then wrap a little more tape around the paper cylinder to eliminate the weird wrinkles in the tape.