Glass cutter once around and then fill with very hot water from a tea kettle, let st a few minuter, next, dump the water and add ice and let sit a few minutes. Now tap from the inside and it should break at the score. I cut wine bottles all the time and have very good luck with the method. All my drinking glasses are recycled wine bottles I get at the recycle center. The above method is what I used in my science classes.
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