uh-oh...stripped windshield bolt!

[burkazoid]

While in the process of removing the windshield this morning, I (somehow) managed to strip one of the four bolts securing the deflector in place. While unfastening this last bolt it seemed to keep getting tighter and tighter as it came off. As a result, it unscrewed about 1/16th of an inch and then froze; the last attempt to get it off the rest of the way is what stripped it. The allen wrench fit it so tightly that I was quite surprised it stripped it.

So, how do I get this thing out? Do I just hacksaw it off and drill it, or is there a better way? It's pretty much frozen; not going anywhere.

Also, any idea where I can order a replacement for this bolt?