I own a 1973 volkswagen beetle, the spark plug blew out of the engine while driving down the road. I bought a 14mm cylinder head rethreader kit, it comes with 4 different inserts, 3/8- 7/16 - 1/2 - 3/4. I don't know which one to use? Could you please tell me how to use to tool and what size? It also lacks a lot of power. joan
Jun 25, 2006 at 10:58 AM