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The two ways that I would use to take out the broken off tape would be: First, chip away at it with a very small chisel and break the tap apart. The second and the quickest, is to blow it out with a cutting torch. The cast iron head won't be phased by the torch. Chase the threads with a tap afterwards to get the slag cleaned out of them. If you had a small set of needle nose plyers and the tap was big enough, one could unscrew the broken tap with the plyers.