Okay folks, so I have here an exhaust manifold from a 1989 Volvo 240. I was able to disconnect it from the downpipe without breaking all but a single bolt. I snapped about a quarter inch from the manifold, so I couldn't really get any leverage with a stud extractor (since I would need at least an inch). I bought a screw extractor and used the provided drill bit to drill through the broken bolt. However, I am finding it difficult to turn the extractor. The handle for my taps don't quite give me enough leverage, and this screw extractor doesn't exactly work with an impact wrench. I've tried a pretty large adjustable wrench, and that didn't help either.
Does anyone have any ideas on how I can turn this thing? I'm thinking I might have to make something so I can turn it with an impact wrench, but beyond that I don't know. The square end of the screw extractor is about 6.5 mm wide, from face to face.