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If you have a broken bolt, the car is not safe to drive.
First you attempt to remove the bolt with an 'ease out' type tool. If that fails you then must either: take the head off to have it drilled, or drill it on the car, then thread and insert a thread repair insert.
the easiest way is to drill it out. drill a hole thru center of broken bolt, make sure it is smaller then the diameter of the bolt. after drilling use a easy out to remove the threads of the bolt. check that the threads in the head are ok! then put in new bolt.
Remove the broken bolt and replace it with a new one. There are several ways to remove that broken bolt. You can remove the valve cover and weld a nut to what is left of the bolt, wait for it to cool off then unthread the broken bolt. You can also drill out the center of the broken bolt and use an easy-out. You can also drill into the broken bolt with a left handed drill bit, sometimes the drill bit will catch and spin out the broken piece. I would go with the first suggestion.
Use a screw extractor or easy out.
Broken fasteners, engine crankcase thread damage, etc.
Most petcocks look like a small bolt with a wing nut style head. The bolt is soft plastic and the wings can be broken off if they are twisted too hard.
If somebody else worked on that area of the engine before him, probably not. That's a tough call.
generally to remove a broken bolt, you will need a drill and an easy out
Use a bolt extractor to remove the broken battery bolt..This is the easiest way...
Because the bolt stop is broken..they have a plastic bolt stop.
It must be installed by a gunsmith.