Buy the kind of kit that includes the reverse twist drill bits and corresponding EZ-Outs(DON'T buy anything chinese). That way you know you've used the correct size bit for the EZ-Out(a common problem area), and that it won't break off in the bolt(common with chinese crapola). Yes- soak it with a good penetrating lube(Kroil is probably the best), and heat the area just before trying to extract. Cast iron or aluminum will expand more than steel(the bolt), and the extractor will act as a heat sink, even shrinking the bolt a slight bit more. HEY- It works!!