Apply penetrating oil to the broken bolt and let it soak
Clean the exposed area with a wire brush
Center punch the bolt for accurate drilling
Drill a small pilot hole straight into the bolt
Increase drill bit size gradually
Use a left-hand drill bit if possible
Insert a screw extractor into the drilled hole
Turn the extractor counterclockwise slowly
Apply steady heat to the surrounding metal if needed
Tap the bolt lightly to break corrosion
Weld a nut onto the broken bolt if enough remains exposed
Grip the welded nut and turn it out
Drill the bolt out completely if extraction fails
Re-tap the threads after removal
Replace the bolt with a new one