3/4 is a pretty good size bit. I would drill the 3/4 hole in something else. Metal would be ideal. But wood would work. If you can clamp it to the side of the building you can use that as a template. Drill a bunch of small holes with a pin vise using that as a guide. Eventually you will have to maybe finish it off with an X Acto saw blade. You can clean the hole up with a Dremel with a sanding drum on low or a round file. It may not be perfect and may take awhile. But you shouldn’t damage anything.
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