Earlier this year I had an idea for a project that need a dozen or so wine bottles cut. After some reading and research I designed my own version of commercially available cutters from materials I had laying around the garage. The problem was after creating the cutter I kept breaking the bottles when trying to run the score line. I tried hot water, and cold water, the combination, a candle, a large hose clamp, air pressure, heating in my oven, and when real frustrated a big hammer.
What I finally settled on was sun light. Yep free and readily available. So here is a short clip on how to cut a bottle using my cutter design and a threaded rod with a couple of nuts on the end.
In case you want to build the cutter here is the link :
The only change was I used a different block of wood as the stop, (shop assistant could not find the other one)