From time to time we succede to damage head of hex screw.

I removed such screw with torx:


First use strong iron to heat up screw and weaken threadlock.

Use small hammer to place torx in damaged hex head.

Unscrew...

I hope this will help.

I learned about screw extractors but they are usefull for bigger screws.



Another solution:

You can try also use drill if it can rotate counter clockwise.

Good luck...