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It was amazing. These things chewed through the bolt like it was butter. After a few minutes of grinding, part of the broken bolt extractor fell out and I could see the original hold I drilled. A little more grinding and all the hardened steel was gone. I then webt back to the drill to enlarge the hole until I could pick out some of the old threads. Finally, running a tap through the hole cleaned it out and now I'm back in business. I have no idea how much a set of these cutters cost, but I need to get a set. The sure are handy to have around.
I still need to find a narrow rivet tool to fit between the louvers to finish off the engine cover.
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