June 17th, 2012, 01:03 PM
Join Date: Mar 2012
You could use a product called " Grip It". Put some in the hole and then use the tighter fitting hex wrench you have.
Another is to take a broken screw extractor and drive it in the hole with a hammer and the turn it out. Use one that fits tightly. It's a small hex screw, so it shouldn't be that difficult to remove. It won't have a great deal of torque on it.
You may also find a metric hex wrench that may fit tighter since its rounded out. It be best if the hex wrench was slightly larger than the hole. Drive it in with a hammer.