Hold the completed roll in one hand and give it a gentle shake. If you hear a rattling sound, that means your coins are loose, and your wrapper is lying to you. It’s not closed—it’s just pretending.
If it rattles, squeeze the roll again and re-crimp the top. You want the roll to be firm, like a cold can of soda—no slosh, no wiggle. When it’s silent, you’ve won. Do a little victory dance (I won’t tell anyone).
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One more thing: try not to squish the roll into a U-shape. If you do, the coins will look like they’ve been through a blender. Keep it straight, keep it proud.
