I’m in the process of making some bottles into tumblers by cutting off the tops and grinding them top of the glass to even it out. I’m using a tile saw and it’s a bit uneven sometimes. When I saw this project over at Instructables and I’ve decided to put it higher on my list of things to do. Looks like it’ll save me some grinding. I don’t mind that. And I’ll get that many more bottle repurposed. Very cool all the way around!