I've drilled them out with carbide tipped drills then used a square drive screw extractor to remove the bolt (after vibrating in Liquid Wrench by tapping the bolt head). I only use the square type screw removers. They are not shinny like the easy outs and I haven't broken one ever. If I remember...
I live in Oakland, CA. When I had a job I worked in the printing industry as a round robin journeyman when printing was only analog. I worked in Q.C. as printing turned digital. I've remodeled my 1912 bungalow and now turn to my garage. I should have done the garage first, but I was young and...