I recently bought a used intake manifold from a Mopar swap meet. After getting it thermal cleaned and painted I realized as I was putting the carburator on that there was half of a bolt stuck down in one of the four holes. I bought a bolt extraction kit but I have been told two different ways of doing this.

So... Do I simply drill the bolt extractor in reverse all the way down inot the screw until the bolt starts unscrewing?

Or do I drill a tiny hole in the screw and then drill the extractor into the hole?

And if neither of these is correct then may I please get a step by step answer?