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Transform a ballpoint pen into a survival whistle mini-pen

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Step 16: Place the mouthpiece on the end

Picture of Place the mouthpiece on the end
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You can use your original pen lid to force open the mouthpiece enough to get it over the end of your whistle. The positioning of the mouthpiece will be a variable you will have to adjust. Look at the next step for troubleshooting ideas.
 
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