This is the ONLY glass cutting method that cuts bottles perfect every time. A flaming string is not good. A blow torch is a BAD IDEA. Glass hammer will not work well. www.greenpowerscience.com I talked to a few people who have cut 1000′s of bottles, they say “you cannot get a perfect cut, top will always be ruined” Not true. Perfect bottle cutting 95% of the time. Glass Bottle Recycling. Reduce Reuse Recycle. Make glasses from bottles. Glass Bottleneck Guitar Slides. DIY Bottleneck, Slide & Lap-Style guitarist.