Rachel Smith , Arizona -
An engine question. A spark-plug blew out of the engine, and threaded the hole. Now, Rachel thinks she has to pull the head and re-bore the hole--but she can't get the head off due to rust. Can she just get the plug welded in the hole? Tom and Ray think she can out in the heli-coil without removing the head, can also try insert with special tip that is already threaded. She can try it herself--if it fails, she can donate car to a dog shelter.