Add hole in body with no flat surfaces?

How do I add a 4mm hole for a keyring in the top of this Suzuki logo? I am a beginner and have tried everything I can think of.

Do you have any solutions?
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STL files cannot be edited however you can do simple booleans such as punching a hole.
Like this…

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For what it’s worth, here’s another approach. Add a keyring loop on top of the logo. Once you do a Union, the loop becomes part of the STL file.

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