Just to close the loop on the topic, I ended up cutting a small square in the strut tower hoping to get a clear path to the screw. First with a small Dremmel, then off to Harbor Freight for a 3" air cutter (yea, new tool)! Despite my best efforts, it wasn't very direct. But I was able to get an extension with the T40 bit in there a little misaligned (what the hell, it's already stripped). Got a pretty good leverage, but it slipped again. So having failed that, I beat on it with a screwdriver some more (I had already chipped away the plastic surround and cut a horizontal slot and was trying to chisel it before I decided to cut the hole). By golly, it started moving. It was all downhill after that.
Once I removed the tensioner, wouldn't you know it, the pulley they sold me is the wrong size (as was the idler pulley). So several stores are selling wrong sized idler and tensioner pulleys out there to the unsuspecting public who's thinking why doesn't my belt fit any more?
To make a long story longer, I now have a new tensioner assembly and is working on the alternator (working, but noticed it was cracked, might as well do it now. That's another story, and already started another thread in the E. Great Lakes.
