How to cut a glass bottle into a drinking glass

I have been cutting glass for a number of years and through that time I found this method to be the most effective.
leave me any question and ill get an answer right to you.
Here is a link to the website where you can find the couple tools needed.
http://www.delphiglass.com/mosaic-supplies/tools-supplies/ephrems-bottle-cutter

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Vlog about me exploring NYC because I'm afraid to get on a plane
https://www.youtube.com/watch?v=1kzSTqBkQ3U
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Видео How to cut a glass bottle into a drinking glass канала John Cirillo