How to make an Uneven Seal #5

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Otherwise, if your nipple is properly made, in a similar orientation as step #1, blow forcefully into the open end of the tube while grazing the end of the nipple in the flame. A hole will quickly pop open in this thin glass. You can stop blowing now, and rotate the end of the glass in the flame. The thin glass of the nipple will pull back from surface tension, leaving a nice hole for the next step.

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