Instructables

Transform a ballpoint pen into a survival whistle mini-pen

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Step 18: Cut ink cartridge

Picture of Cut ink cartridge
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Measure and cut the ink cartridge at 2 1/8 inches from the part which begins the straight portion. The ink doesn't generally come out, but if you leave it sitting somewhere on an angle, or touch the ends with your fingers, it can get a little messy.
 
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