0Robot Lover 8 years ago ReplyUpvoteI remember someone showing me the string trick years ago, it worked somewhat. I just read an instructable for using a hotwire cutter (think styrofoam cutting) for cutting plate glass. I have never tried this but perhaps taking a piece of pc board and looping .020-.030 stainless aircraft safety wire around a bottle, using two holes no more than about 1/16th inch apart in the pc board, attach 6-12 v battery charger to each end of stainless wire, slide pc board against bottle to sinch wire around bottle. Heat it for a time, remove wire and quench in cold bucket of water? I think it will work. Make sure it is just raw pc board or bakelite.