If you don't have, or can't find a left handed drill.. I have had good luck using the same procedure, drilling through center, heating and using a torx bit as an easy out. They come in small sizes and are cheap. The key is to quickly heat the case around the fastener. The case will expand With heat at a faster rate than the broken fastener but once heated, they will both expand the same amount and it can still be tight. So heat quickly and keep heat from directly hitting the broken bolt. It often doesn't take much heat to make it happen. The way I look at it is, I can always heat it more later. If it doesn't work right away, let it cool completely and try again.
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