Man I know exactly how you feel. When we replaced my rear shocks about a month ago we rang off 3 out of the 4 bolts on the top of the shocks, two of them we drilled and used an easy out. Tried drilling the third one and the bits just stopped halfway through, burnt through 7 bits and didn't make any progress. We ended up blowing the bolt out with a combination of a plasma cutter and air chisel. Then used a larger bolt to replace it. I hope you don't have to resort to those measures. Maybe the easy out will do it for you so you don't have to tap new threads.
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