Hi chris--if it is possible to drill a hole thru the plug, then you could use an easy-out extractor to get a grip on the plug. Do not drill hole until you have the easy-outs because the hole drilled has to match the easy-out. Easy-outs are bolt extrators available at Sears or other hardware stores. The easy out is tapped into the new hole with a hammer untill it sits snug, then use a wrench to turn out-use smooth steady slow pull--works best. Use a solvent such as wd40 or penetrating oil to soften up the threads first. jorgen