Step 1: Materials
Youre going to need 4 ft of some kind of thick string or thin rope, scissors, straw, ruler, id card or thin plastic but strong, and hot glue.
Step 5: Feed it throught the Tube
Step 6: Through the other End
Step 7: The Lock
Take the card and cut a inch long stip out. then shave the edges and punch three holes along the middle.