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Signing UpStep 1Materials List
1. can opener
2. a soda can (Pepsi is easiest to remove top)
3. foam core, paper towel or spray insulation... your choice
4. some kind of jar or canister. (I used a small jam jar i had left over)
5. Hot glue
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I may post an instructable soon.
The trick is not to use a can opener, but a dremel with a short blade and carefully cut all around the top.