Step 3: Cutting Flap Part 1

2nd cut a slit near the bottom of the bottle.
About 1 1/2 inches long. (I'm from the old school not to good at converting to metric.)
I choose to cut it in the smooth part. A lot less resistance there after all the knife is sharp.
Done Thanks for the input.
Could you turn off the lights and take a photo of it lit indoors?

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Bio: I'm a DIY kinda guy
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