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Not that I'd know anythign about this, but if you have a metal stem for your bond, you are going to want an oval hole. The stem is going to go in at an angle, not perpendicular to the side of the bottle. So drill a hole, then use a Dremmel to grind it to the right shape...OR - drill a hole that is much to big, and use silicone to fill the gaps.
Also, it's best to use a grommet, so you can slide the stem out later if need be.
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