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Water bottle rockets!

Step 3Drilling.

Drilling.
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The soda bottle itself is an excellent holder for the cork as you drill it.

For best results, make a guide hole by first drilling a hole with a bit around 1/8" size.

Then drill a hole with a 7/32 or 1/4" bit. I prefer a 7/32" bit because it's a bit smaller and should make a tighter fit, but both have worked fine. The hole will fill up a little with the surrounding cork filling up the new space, so make sure to drill all the way through twice to clear away all of the cork.
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It's me, Prince Nagle Nagle!