i will also tell you how to make a cocktail umbrella into a blowgun dart (i have too much time on my hands)
Step 1: To make the first dart
2. wrap small amount of blu-tac around top of nail so it can still fit point-first into the rubber clip cover's larger end
3. put the nail point-first through the hole in the rubber cover as pictured and pull tightly so the blu-tac fastens it.
4. straighten the nail (it tends to be crooked) and fire!