ooooh.... well, you may not be able to. They make a spark plug hole tap. You can usually get them at an auto parts store. I know Napa can get them, or keeps them. Put grease on the end of the tap when you start it in, that will keep the shavings from falling in the engine. MAKE SURE THE PISTON IS AT TDC! Pull the tap out often and clean/install new grease. If the threads don't clean up.... Two choices. Another head, or you can try a spark plug heli-coil. I have used these before, and the worked.... for a while. The safest way to repair this is to pull the head. I think most here would agree that it isn't that hard to pull off, and could save you $$$. IMHO.
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