Years ago (a lot of years) I had a "auto cutter) from Auto World. It was a soldering iron with a tip that had an exacto blade silver soldered to it. I seem to remember it working real well. I tried to make one recently but it doesn't get hot enough to really do a good job. I tried it on a 40 watt iron, then tried a 45 watt iron - no particular difference. Does anyone remember these or maybe still have one? I was wondering what wattage he used.