Apply penetrating oil and let it soak
Tap the screw lightly to help loosen rust
Use a center punch to mark the screw
Drill a small pilot hole into the screw
Use a left-hand drill bit if available
Insert a screw extractor and turn counterclockwise
Grip any exposed part with locking pliers
Heat the surrounding metal if appropriate
Cut a slot in the screw head and use a flathead screwdriver
Drill out the screw completely if extraction fails
Re-tap the hole or use a thread insert if needed