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Step 1: What You Need
BIC pen and rubber band( or two)
Step 2: Building
Take the cap off and seperate the base and ink
Now take off the black part and turn it around so the big part touches the tip
Put it back in the base tip first( if you want put something sharp on the end)
It should slide easy and be a hidden blade you can also reverse it if needed
Now put the rubber band on your wrist and put the pen through have fun assassinating