I've been meaning to change the struts on my rear door on my wagon and they use triple square (12-sided star) sockets. I bought a decent looking set of sockets but the screws must be factory tight because the 8MM socket is just stripping the teeth!

Are there any suggestions on how to get them out? I am really preferring some standard hex bolts right around now. If I can get them off, I will just get a set from the hardware store and so it's easier in the future to deal with.

Normally I would drill them out. There is a 'drill-out' or 'screw-out' kit at Sears I'm thinking of acquiring anyway. Any other least-painful and least-stressful approaches?