1. Cut a sturdy but flexible piece of paper about 3-4" long and attach double-sided tape to one side. Stuff it into the cassette with the sticky side facing the centre of the roll until the paper stops. You can also twist the center a bit to pull the paper in more.
2. Pull out the film! Yay, it works! Now you can put it back into the camera and make double exposures or whatever else you had in mind.
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