I bought this to fix a burned out spark plug in a 2001 Crown Victoria. The mechanic examined the car and I was told it would cost more to fix than it was worth. On a whim I bought this product and watched several instructional videos on a very popular free video site that detailed the process of regrooving a spark plug hole. With this product and a few other simple tools (a 3/8" socket, some spark plug sockets and some extensions) I was able to rethread to install a new threaded insert spark plug. The whole procedure took less than an hour and after that my machine worked perfectly. I later sold the tool on an auction site for almost the same price as me so the total repair cost was about $15.00. I would also like to add that this was the very first time I've ever worked on a car. Without this tool it would be impossible to fix it. So if you have a blown spark plug, BUY THIS TOOL. You will be glad what did you do.
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