1. Insert the eraser end of a pencil into the cap.
2. Set the non eraser end on a hard surface and push against the brass cap with the eraser end.
3. Unscrew the black plastic tab on the top of the cap using a penny while applying pressure on the brass side with the eraser end of the pencil.
4. The black cap will come off and you can then wiggle the clip off.
5. Reassemble.