A QUICK WORD OF WARNING, PLASTIC IS NOT THE STRONGEST MATERIAL TO MAKE A CANNON OUT OF AND IF YOU FORM AN IMPROPER BACK SEAL THE REAR OF THE CANNON CAN EXPLODE OUT. PLEASE USE WITH CAUTION, ONLY USE SMALL AMOUNTS OF POWDER, AND USE PROPER PROTECTION AND A BRICK OR WALL AROUND THE CANNON DURRING THE FIRST FEW FIRINGS.
Step 1: Materials
1. bic pen
3. small sharp metal tool with small diameter to punch out the fuse hole like the red one pictured below, but a paper clip will work just as well
4. a small knife to help shape the plastic when its too hot to touch
5. a small thin stcik to use for measurement purposes, just make sure it will fit inside the pen an dis longer than the total length of the pen.