Hi there,
I have used this method before, not just for spark plugs but for faulty bolt heads as well,
I you have good access to the plug break the plug insulator away (not in side the plug just out side) place a large nut over the plug body and weld inside so that you can put a socket on the nut to up do the broken plug. Depending on access to the plug this should work.
Mark (mhpautos)
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Sunday, November 11th, 2007 AT 4:00 AM