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Enlarging an existing hole is possible. It would be best to make a guide (can be made of a piece of scrap 1x wood). You drill the correct sized hole in the wood and find a way to hold it in place over your existing hole. It has to be solid so it doesn't slip while you're getting the new hole started. Go very slowly and do not apply access pressure. The weight of the drill is about all the pressure you want. It will take some time to get through the glass but it can be done.
However...if you've never drill glass before, I'm not sure I would recommend starting with this project. I personally still use a wood guide even with new holes, but that's just me. If you have a local LFS that would do it, I would recommend that route. Just my $.02.
However...if you've never drill glass before, I'm not sure I would recommend starting with this project. I personally still use a wood guide even with new holes, but that's just me. If you have a local LFS that would do it, I would recommend that route. Just my $.02.