Step 7Optional: Disinfectant Backpack
The blue backpack is exactly 1'' by 1 1/2'', so you want to cut a rectangle that shape out of the thin plastic sheet. This will be placed over the missing back, as to create a sturdy containment for holding all of your solutions. Then using your dremel tool, drill a small hole on the top of the container, which you can use to fill it up. As a water proof cap, I used a tiny mechanical pencil eraser.
Then all you have to do is glue it up!
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