Apply penetrating oil and let it soak
Center punch the broken bolt
Drill a pilot hole into the bolt
Use a left-hand drill bit if possible
Insert a screw extractor into the hole
Turn the extractor counterclockwise slowly
Apply heat to the surrounding metal if needed
Tap the bolt lightly to help break corrosion
Use locking pliers if any bolt remains exposed
Weld a nut onto the broken bolt if accessible
Drill out the bolt completely if extraction fails
Re-tap the threads or install a thread insert if damaged