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Belt grinder. I'll use a new 60 grit ceramic or Norton SG belt (they cut very cool and fast) to hog off the main portion of the metal. It helps to take a magic marker and draw out the the outline...

It could be done, but I'd probably take off the length of the blade past the crack. You won't lose width, and you'll get rid of the crack. Some folks like shorter blades anyway. I have a couple...